✅ Extreme Newbie - Can't Call Class Element Properly.

Katt Does Art · 2025-02-19T16:33:31.274Z

Hello! I'll start off by kindly asking you don't laugh at my lack of knowledge. I am doing a 4 person group project alone because my teacher is a horrible person and I need help badly. I am trying to store variables in an array, and then allow the user to calculate the total cost of the stored variables by pressing that calculate button. I feel like I've gotten it all, I just can't get the button to call the sum properly and display it in the table. Any help at all would be appreciated more than you could possible imagine~ I'll post my full code below, as well as an image of what it currently outputs

K

Katt Does ArtOP•2/19/25, 4:34 PM

Code:

namespace Group_3_Project_Final
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }

        DataTable table = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            table.Columns.Add("Item Description");
            table.Columns.Add("Order Quantity", typeof(int));
            table.Columns.Add("Unit Price", typeof(int));

            dataGridView1.DataSource = table;
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            table.Rows.Add(textBoxItem.Text, textBoxQty.Text, textBoxUnit.Text);
            dataGridView1.DataSource = table;

            //Variable declarations:
            string strDescription = textBoxItem.Text;
            decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
            decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);


            //calculate input cost and save to array
            decimal inputCost = decimalQuantity * decimalPrice;
            decimal[] inputCostArray = { inputCost };


            //Clear boxes upon saving.
            textBoxItem.Clear();
            textBoxQty.Clear();
            textBoxUnit.Clear();
        }
        public class Globals
        {
            public static void DisplayAndSum(decimal[] inputCostArray)
            {
                decimal sum = 0;
                foreach (var element in inputCostArray)
                {
                    sum += element;
                }
            }
        }

        private void calculateBtn_Click(object sender, EventArgs e)
        {
            var totalSum = new Globals();
            table.Rows.Add (totalSum);

        }

        private void clearBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource=null;
        }
    }
}

namespace Group_3_Project_Final
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }

        DataTable table = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            table.Columns.Add("Item Description");
            table.Columns.Add("Order Quantity", typeof(int));
            table.Columns.Add("Unit Price", typeof(int));

            dataGridView1.DataSource = table;
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            table.Rows.Add(textBoxItem.Text, textBoxQty.Text, textBoxUnit.Text);
            dataGridView1.DataSource = table;

            //Variable declarations:
            string strDescription = textBoxItem.Text;
            decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
            decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);


            //calculate input cost and save to array
            decimal inputCost = decimalQuantity * decimalPrice;
            decimal[] inputCostArray = { inputCost };


            //Clear boxes upon saving.
            textBoxItem.Clear();
            textBoxQty.Clear();
            textBoxUnit.Clear();
        }
        public class Globals
        {
            public static void DisplayAndSum(decimal[] inputCostArray)
            {
                decimal sum = 0;
                foreach (var element in inputCostArray)
                {
                    sum += element;
                }
            }
        }

        private void calculateBtn_Click(object sender, EventArgs e)
        {
            var totalSum = new Globals();
            table.Rows.Add (totalSum);

        }

        private void clearBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource=null;
        }
    }
}

namespace Group_3_Project_Final
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }

        DataTable table = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            table.Columns.Add("Item Description");
            table.Columns.Add("Order Quantity", typeof(int));
            table.Columns.Add("Unit Price", typeof(int));

            dataGridView1.DataSource = table;
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            table.Rows.Add(textBoxItem.Text, textBoxQty.Text, textBoxUnit.Text);
            dataGridView1.DataSource = table;

            //Variable declarations:
            string strDescription = textBoxItem.Text;
            decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
            decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);


            //calculate input cost and save to array
            decimal inputCost = decimalQuantity * decimalPrice;
            decimal[] inputCostArray = { inputCost };


            //Clear boxes upon saving.
            textBoxItem.Clear();
            textBoxQty.Clear();
            textBoxUnit.Clear();
        }
        public class Globals
        {
            public static void DisplayAndSum(decimal[] inputCostArray)
            {
                decimal sum = 0;
                foreach (var element in inputCostArray)
                {
                    sum += element;
                }
            }
        }

        private void calculateBtn_Click(object sender, EventArgs e)
        {
            var totalSum = new Globals();
            table.Rows.Add (totalSum);

        }

        private void clearBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource=null;
        }
    }
}

namespace Group_3_Project_Final
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }

        DataTable table = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            table.Columns.Add("Item Description");
            table.Columns.Add("Order Quantity", typeof(int));
            table.Columns.Add("Unit Price", typeof(int));

            dataGridView1.DataSource = table;
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            table.Rows.Add(textBoxItem.Text, textBoxQty.Text, textBoxUnit.Text);
            dataGridView1.DataSource = table;

            //Variable declarations:
            string strDescription = textBoxItem.Text;
            decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
            decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);


            //calculate input cost and save to array
            decimal inputCost = decimalQuantity * decimalPrice;
            decimal[] inputCostArray = { inputCost };


            //Clear boxes upon saving.
            textBoxItem.Clear();
            textBoxQty.Clear();
            textBoxUnit.Clear();
        }
        public class Globals
        {
            public static void DisplayAndSum(decimal[] inputCostArray)
            {
                decimal sum = 0;
                foreach (var element in inputCostArray)
                {
                    sum += element;
                }
            }
        }

        private void calculateBtn_Click(object sender, EventArgs e)
        {
            var totalSum = new Globals();
            table.Rows.Add (totalSum);

        }

        private void clearBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource=null;
        }
    }
}

A

Angius•2/19/25, 4:34 PM

$code

AAngius $code

M

MODiX•2/19/25, 4:34 PM

To post C# code type the following:
```cs
// code here
```

Get an example by typing

$codegif

$codegif

in chat

For longer snippets, use: https://paste.mod.gg/

A

Angius•2/19/25, 4:35 PM

Not sure why you have that

Globals

Globals

Globals

Globals class... inside of another class

K

Katt Does ArtOP•2/19/25, 4:35 PM

What happens:

AAngius Not sure why you have that `Globals` class... inside of another class

K

Katt Does ArtOP•2/19/25, 4:36 PM

Complete transparency, I've been working on this for like 10 hours, and I've been taking a lot of suggestions from google

A

Angius•2/19/25, 4:36 PM

Well, then, your

DisplayAndSum()

DisplayAndSum()

DisplayAndSum()

DisplayAndSum() method does, effectively, nothing

K

Katt Does ArtOP•2/19/25, 4:36 PM

I feel very out of my depth here, but I have no one to really ask for help, Like I said my teacher isn't very... helpful

A

Angius•2/19/25, 4:36 PM

It takes an array of decimals, sums them, and... does nothing with the sum

K

Katt Does ArtOP•2/19/25, 4:36 PM

ah

K

Katt Does ArtOP•2/19/25, 4:38 PM

var totalSum = new Globals();
table.Rows.Add (totalSum);

That's what I was trying to do here, but clearly I am not knowledgable enough to make it happen lmfao

I am trying to display it to a new row basically

KKatt Does Art What happens:

K

Katt Does ArtOP•2/19/25, 4:39 PM

I was trying to get the button to call the sum itself, but I was running into so many issues, this is the only way I could get it to work, so I thought I did it, and then it put this out lol

K

Katt Does ArtOP•2/19/25, 4:44 PM

Is there a way to properly call it that I'm missing? Or am I just doing it way wrong?

A

Angius•2/19/25, 4:45 PM

Well, you will have to get the array into this method

A

Angius•2/19/25, 4:45 PM

Easiest way to have any data available to multiple methods is using a private field

A

Angius•2/19/25, 4:46 PM

For example,

class Foo
{
    private int _num;

    public void Bar()
    {
        _num = 69;
    }

    public void Baz()
    {
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    private int _num;

    public void Bar()
    {
        _num = 69;
    }

    public void Baz()
    {
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    private int _num;

    public void Bar()
    {
        _num = 69;
    }

    public void Baz()
    {
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    private int _num;

    public void Bar()
    {
        _num = 69;
    }

    public void Baz()
    {
        Console.WriteLine($"Number is {_num}");
    }
}

K

Katt Does ArtOP•2/19/25, 4:47 PM

I think that's what I was trying to accomplish but I wasn't able to pull the information out of the save area without an error

A

Angius•2/19/25, 4:47 PM

Bar

Bar

Bar

Bar here would be

saveBtn_Click

saveBtn_Click

saveBtn_Click

saveBtn_Click that creates the data, and

Baz

Baz

Baz

Baz would be

calculateBtn_Click

calculateBtn_Click

calculateBtn_Click

calculateBtn_Click that uses it

K

Katt Does ArtOP•2/19/25, 4:47 PM

That's why all the calculation stuff is there

K

Katt Does ArtOP•2/19/25, 4:48 PM

mmm okay, I think I understand

K

Katt Does ArtOP•2/19/25, 4:50 PM

So, Like this?

namespace Group_3_Project_Final
{
    public partial class Form1 : Form
    {
      

        DataTable table = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            table.Columns.Add("Item Description");
            table.Columns.Add("Order Quantity", typeof(int));
            table.Columns.Add("Unit Price", typeof(int));

            dataGridView1.DataSource = table;
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            table.Rows.Add(textBoxItem.Text, textBoxQty.Text, textBoxUnit.Text);
            dataGridView1.DataSource = table;

            //Variable declarations:
            string strDescription = textBoxItem.Text;
            decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
            decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);


            //Clear boxes upon saving.
            textBoxItem.Clear();
            textBoxQty.Clear();
            textBoxUnit.Clear();
        }

        private void calculateBtn_Click(object sender, EventArgs e)
        {
            //calculate input cost and save to array
            decimal inputCost = decimalQuantity * decimalPrice;
            decimal[] inputCostArray = { inputCost };
                
               decimal sum = 0;
                foreach (var element in inputCostArray)
                {
                    sum += element;
                }
        }

        private void clearBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource=null;
        }
    }
}

namespace Group_3_Project_Final
{
    public partial class Form1 : Form
    {
      

        DataTable table = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            table.Columns.Add("Item Description");
            table.Columns.Add("Order Quantity", typeof(int));
            table.Columns.Add("Unit Price", typeof(int));

            dataGridView1.DataSource = table;
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            table.Rows.Add(textBoxItem.Text, textBoxQty.Text, textBoxUnit.Text);
            dataGridView1.DataSource = table;

            //Variable declarations:
            string strDescription = textBoxItem.Text;
            decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
            decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);


            //Clear boxes upon saving.
            textBoxItem.Clear();
            textBoxQty.Clear();
            textBoxUnit.Clear();
        }

        private void calculateBtn_Click(object sender, EventArgs e)
        {
            //calculate input cost and save to array
            decimal inputCost = decimalQuantity * decimalPrice;
            decimal[] inputCostArray = { inputCost };
                
               decimal sum = 0;
                foreach (var element in inputCostArray)
                {
                    sum += element;
                }
        }

        private void clearBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource=null;
        }
    }
}

namespace Group_3_Project_Final
{
    public partial class Form1 : Form
    {
      

        DataTable table = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            table.Columns.Add("Item Description");
            table.Columns.Add("Order Quantity", typeof(int));
            table.Columns.Add("Unit Price", typeof(int));

            dataGridView1.DataSource = table;
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            table.Rows.Add(textBoxItem.Text, textBoxQty.Text, textBoxUnit.Text);
            dataGridView1.DataSource = table;

            //Variable declarations:
            string strDescription = textBoxItem.Text;
            decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
            decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);


            //Clear boxes upon saving.
            textBoxItem.Clear();
            textBoxQty.Clear();
            textBoxUnit.Clear();
        }

        private void calculateBtn_Click(object sender, EventArgs e)
        {
            //calculate input cost and save to array
            decimal inputCost = decimalQuantity * decimalPrice;
            decimal[] inputCostArray = { inputCost };
                
               decimal sum = 0;
                foreach (var element in inputCostArray)
                {
                    sum += element;
                }
        }

        private void clearBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource=null;
        }
    }
}

namespace Group_3_Project_Final
{
    public partial class Form1 : Form
    {
      

        DataTable table = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            table.Columns.Add("Item Description");
            table.Columns.Add("Order Quantity", typeof(int));
            table.Columns.Add("Unit Price", typeof(int));

            dataGridView1.DataSource = table;
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            table.Rows.Add(textBoxItem.Text, textBoxQty.Text, textBoxUnit.Text);
            dataGridView1.DataSource = table;

            //Variable declarations:
            string strDescription = textBoxItem.Text;
            decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
            decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);


            //Clear boxes upon saving.
            textBoxItem.Clear();
            textBoxQty.Clear();
            textBoxUnit.Clear();
        }

        private void calculateBtn_Click(object sender, EventArgs e)
        {
            //calculate input cost and save to array
            decimal inputCost = decimalQuantity * decimalPrice;
            decimal[] inputCostArray = { inputCost };
                
               decimal sum = 0;
                foreach (var element in inputCostArray)
                {
                    sum += element;
                }
        }

        private void clearBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource=null;
        }
    }
}

K

Katt Does ArtOP•2/19/25, 4:51 PM

Or would I declare the variables outside calculate?

A

Angius•2/19/25, 4:51 PM

Where are you getting

decimalQuantity

decimalQuantity

decimalQuantity

decimalQuantity and

decimalPrice

decimalPrice

decimalPrice

decimalPrice from?

A

Angius•2/19/25, 4:52 PM

They're not local variables, not parameters, not fields

K

Katt Does ArtOP•2/19/25, 4:52 PM

The text boxes

A

Angius•2/19/25, 4:52 PM

They're local variables to

saveBtn_Click

saveBtn_Click

saveBtn_Click

saveBtn_Click

K

Katt Does ArtOP•2/19/25, 4:52 PM

//Variable declarations:
string strDescription = textBoxItem.Text;
decimal decimalQuantity = Convert.ToDecimal(textBoxQty.Text);
decimal decimalPrice = Convert.ToDecimal(textBoxUnit.Text);

A

Angius•2/19/25, 4:52 PM

They only exist within the

{}

{}

of

saveBtn_Click

saveBtn_Click

saveBtn_Click

saveBtn_Click

K

Katt Does ArtOP•2/19/25, 4:52 PM

mmm

K

Katt Does ArtOP•2/19/25, 4:52 PM

how do I fix that?

A

Angius•2/19/25, 4:52 PM

That's what fields help with

K

Katt Does ArtOP•2/19/25, 4:52 PM

I think that's probably the root of my issue

A

Angius•2/19/25, 4:53 PM

class Foo
{
    public void Bar()
    {
        int _num = 69;
    }

    public void Baz()
    {
        // `_num` does not exist here
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    public void Bar()
    {
        int _num = 69;
    }

    public void Baz()
    {
        // `_num` does not exist here
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    public void Bar()
    {
        int _num = 69;
    }

    public void Baz()
    {
        // `_num` does not exist here
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    public void Bar()
    {
        int _num = 69;
    }

    public void Baz()
    {
        // `_num` does not exist here
        Console.WriteLine($"Number is {_num}");
    }
}

A

Angius•2/19/25, 4:53 PM

class Foo
{
    private int _num;

    public void Bar()
    {
        _num = 69;
    }

    public void Baz()
    {
        // `_num` exists here
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    private int _num;

    public void Bar()
    {
        _num = 69;
    }

    public void Baz()
    {
        // `_num` exists here
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    private int _num;

    public void Bar()
    {
        _num = 69;
    }

    public void Baz()
    {
        // `_num` exists here
        Console.WriteLine($"Number is {_num}");
    }
}

class Foo
{
    private int _num;

    public void Bar()
    {
        _num = 69;
    }

    public void Baz()
    {
        // `_num` exists here
        Console.WriteLine($"Number is {_num}");
    }
}

A

Angius•2/19/25, 4:53 PM

$scopes

AAngius $scopes

M

MODiX•2/19/25, 4:53 PM

scope A {
  thing a;
  scope B {
    thing b;
  }
}

scope A {
  thing a;
  scope B {
    thing b;
  }
}

scope A {
  thing a;
  scope B {
    thing b;
  }
}

scope A {
  thing a;
  scope B {
    thing b;
  }
}

thing a

thing a

thing a

thing a is available in

scope A

scope A

scope A

scope A and

scope B

scope B

scope B

scope B

thing b

thing b

thing b

thing b is available only in

scope B

scope B

scope B

scope B

A

Angius•2/19/25, 4:53 PM

Braces create scopes. Things are only available in their scope and all child scopes

K

Katt Does ArtOP•2/19/25, 4:54 PM

right

K

Katt Does ArtOP•2/19/25, 4:56 PM

My confusion is how I would acomplish this

Savebtn {
inputs;
CalcBtn {
doing things w those inputs;
}
}

Whenever I try to edit the set voids it breaks everything and I basically have to start over

K

Katt Does ArtOP•2/19/25, 4:56 PM

unless it's way more simple than I think and I'm just dumb which is possible lol

K

Katt Does ArtOP•2/19/25, 4:58 PM

Because from what I understand you can't nest voids into eachother

K

Katt Does ArtOP•2/19/25, 4:58 PM

Because they have to enter the information by pressing save

A

Angius•2/19/25, 4:59 PM

Wym "voids"?

K

Katt Does ArtOP•2/19/25, 4:59 PM

private void calculateBtn_Click(object sender, EventArgs e)

private void calculateBtn_Click(object sender, EventArgs e)

private void calculateBtn_Click(object sender, EventArgs e)

private void calculateBtn_Click(object sender, EventArgs e)

A

Angius•2/19/25, 5:00 PM

That's a method

K

Katt Does ArtOP•2/19/25, 5:00 PM

Sorry

A

Angius•2/19/25, 5:00 PM

$structure

AAngius $structure

M

MODiX•2/19/25, 5:00 PM

namespace Namespace;

[Attribute]
public class Class
{
    public string PublicField;
    private bool _privateField;    

    public int PublicProperty { get; set; }

    public Class() {} // Constructor

    public void Method(int parameter)
    {
        var localVariable = parameter; 

        int LocalMethod(string param) { return 3; }
    } 
}

namespace Namespace;

[Attribute]
public class Class
{
    public string PublicField;
    private bool _privateField;    

    public int PublicProperty { get; set; }

    public Class() {} // Constructor

    public void Method(int parameter)
    {
        var localVariable = parameter; 

        int LocalMethod(string param) { return 3; }
    } 
}

namespace Namespace;

[Attribute]
public class Class
{
    public string PublicField;
    private bool _privateField;    

    public int PublicProperty { get; set; }

    public Class() {} // Constructor

    public void Method(int parameter)
    {
        var localVariable = parameter; 

        int LocalMethod(string param) { return 3; }
    } 
}

namespace Namespace;

[Attribute]
public class Class
{
    public string PublicField;
    private bool _privateField;    

    public int PublicProperty { get; set; }

    public Class() {} // Constructor

    public void Method(int parameter)
    {
        var localVariable = parameter; 

        int LocalMethod(string param) { return 3; }
    } 
}

K

Katt Does ArtOP•2/19/25, 5:01 PM

I am starting to get lost I think. They are defined as methods by the program, I can not change that or it breaks everything

A

Angius•2/19/25, 5:02 PM

Never told you to change the methods