Simple Calculator Problem

Hi guys I'm new to this forum.... :)

I've been working with my simple calculator for almost 2 days now... I am familiar with VB.NET codes and tried to relate it with C# codes... Here is my code:

Code:

---

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace prjLabExer5
{
 
    public partial class frmLabExer5 : Form
    {
     
 
       
        public frmLabExer5()
        {
            InitializeComponent();

        }
        string operand;
        double Value1 = 0;
        double Value2 = 0;
        //Double memory;
        double ValueT = 0;
     

        private void btn1_Click(object sender, EventArgs e)
        {
            txtValue.Text += "1";
        }

        private void btn2_Click(object sender, EventArgs e)
        {
            txtValue.Text += "2";
        }

        private void btn3_Click(object sender, EventArgs e)
        {
            txtValue.Text += "3";
        }

        private void btn4_Click(object sender, EventArgs e)
        {
            txtValue.Text += "4";
        }

        private void btn5_Click(object sender, EventArgs e)
        {
            txtValue.Text += "5";
        }

        private void btn6_Click(object sender, EventArgs e)
        {
            txtValue.Text += "6";
        }

        private void btn7_Click(object sender, EventArgs e)
        {
            txtValue.Text += "7";
        }

        private void btn8_Click(object sender, EventArgs e)
        {
            txtValue.Text += "8";
        }

        private void btn9_Click(object sender, EventArgs e)
        {
            txtValue.Text += "9";
        }

        private void btndot_Click(object sender, EventArgs e)
        {
            txtValue.Text += ".";
           
        }

        private void btnplus_Click(object sender, EventArgs e)
        {
        operand = "+";
        Value1 = Convert.ToDouble(txtValue.Text);
        txtValue.Clear();


        }

        private void btnminus_Click(object sender, EventArgs e)
        {
            operand = "-";
            Value1 = Convert.ToDouble(txtValue.Text);
            txtValue.Clear();


        }

        private void btnmulti_Click(object sender, EventArgs e)
        {
            operand = "*";
            Value1 = Convert.ToDouble(txtValue.Text);
            txtValue.Clear();
        }

        private void btndivide_Click(object sender, EventArgs e)
        {
            operand = "/";
            Value1 = Convert.ToDouble(txtValue.Text);
            txtValue.Clear();

        }
        private void btnequals_Click(object sender, EventArgs e)
        {
            Value2 = Convert.ToDouble(txtValue.Text);
            switch (operand)
            {
                case "+":
                    ValueT = Value1 + Value2;
                    txtValue.Text = ValueT.ToString() ;
                    break;
                case "-":
                    ValueT = Value1 - Value2;
                    txtValue.Text = ValueT.ToString();
                    break;0
                case "*":
                    ValueT = Value1 * Value2;
                    txtValue.Text = ValueT.ToString();
                    break;
                case "/":
                    if (Value2 == 0)
                    {
                        txtValue.Text = "Infinity";
                    }
                    else if (Value2 != 0)
                    {
                        ValueT = Value1 / Value2;
                        txtValue.Text = ValueT.ToString();
                    }
                    break;
            }

        }
    }
}

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This program cannot display the result on the textbox... I dont know what I'm missing... please help me guys.... Thanks

have you checked to make sure the "btnequals_Click" event is actually firing?

Yes. On the surface the code looks good. You have to put a few break points and debug the application. Maybe the "operand" doens't have the right value or as the previous poster suggested the handler is not being called.

I'd initialize the operand at the top, instead of just declaring it:
string operand = "+";

That way you'd know if it was ever assigned something else. But now that i think about it you'd prolly get an exception if it isn't initialized when you switch on it.

Yeah, use the debugger, but some breakpoint here and there inside btnequals_Click, to see if it getting called at all. The event might have been detached from the button somehow?

hmm.. I dont know how to check wether the btnequals is being called or not... been working but still no go...

Use the debugger and set a breakpoint...

Incidentally, you could make all of your buttons use the same event handler and do:

Code:

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Button btn = sender as Button;

txtValue.Text += btn.Text;

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And similar for the operand (although I think the correct term is 'operator') buttons...
May save you a bit of typ-o-ing...