Hi Dr Purdum,

I am a junior programmer looking to learn more about the .NET side of things, along with OOP methods, your book has been the bext book by far for an aspiring developer like myself.

Can you please help me with this.

I am currently working through PART 2, Chapter 3, Page 58 of your book.

I am working through the Integer Division problem, i have entered the code precisely, however i am constantly receiving the following error when trying to build the code.

"The name 'txtOperand1' does not exist in the current context"


where am i going wrong??????


Kindest Regards
Steve

p.s have pasted my code below




using System;
using System.Drawing;
using System.Windows.Forms;
publicclassfrmMain : Form
{
privateLabel int1input;
privateLabel label1;
privateTextBox textBox1;
privateTextBox textBox2;
privateButton btnCalc;
privateButton btnExit;
privateLabel label2;
#region Windows code
privatevoid InitializeComponent()
{
this.int1input = new System.Windows.Forms.Label();
this.label1 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.textBox2 = new System.Windows.Forms.TextBox();
this.label2 = new System.Windows.Forms.Label();
this.btnCalc = new System.Windows.Forms.Button();
this.btnExit = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// int1input
//
this.int1input.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.int1input.Location = new System.Drawing.Point(36, 42);
this.int1input.Name = "int1input";
this.int1input.Size = new System.Drawing.Size(152, 20);
this.int1input.TabIndex = 0;
this.int1input.Text = "Enter first integer value:";
this.int1input.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// label1
//
this.label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label1.Location = new System.Drawing.Point(36, 76);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(152, 20);
this.label1.TabIndex = 1;
this.label1.Text = "Enter first second value:";
this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(216, 41);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(137, 20);
this.textBox1.TabIndex = 2;
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point(216, 76);
this.textBox2.Name = "textBox2";
this.textBox2.Size = new System.Drawing.Size(137, 20);
this.textBox2.TabIndex = 3;
//
// label2
//
this.label2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label2.Location = new System.Drawing.Point(33, 131);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(320, 46);
this.label2.TabIndex = 4;
this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// btnCalc
//
this.btnCalc.Location = new System.Drawing.Point(33, 210);
this.btnCalc.Name = "btnCalc";
this.btnCalc.Size = new System.Drawing.Size(129, 23);
this.btnCalc.TabIndex = 5;
this.btnCalc.Text = "&Calculate";
this.btnCalc.UseVisualStyleBackColor = true;
//
// btnExit
//
this.btnExit.Location = new System.Drawing.Point(224, 210);
this.btnExit.Name = "btnExit";
this.btnExit.Size = new System.Drawing.Size(129, 23);
this.btnExit.TabIndex = 6;
this.btnExit.Text = "&Exit";
this.btnExit.UseVisualStyleBackColor = true;
//
// frmMain
//
this.ClientSize = new System.Drawing.Size(390, 256);
this.Controls.Add(this.btnExit);
this.Controls.Add(this.btnCalc);
this.Controls.Add(this.label2);
this.Controls.Add(this.textBox2);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.label1);
this.Controls.Add(this.int1input);
this.Name = "frmMain";
this.Load += new System.EventHandler(this.frmMain_Load);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
public frmMain()
{
InitializeComponent();
}
publicstaticvoid Main()
{
frmMain main = newfrmMain();
Application.Run(main);
}
privatevoid frmMain_Load(object sender, EventArgs e)
{
}
privatevoid btnCalc_Click(object sender, EventArgs e)
{
bool flag;
int operand1;
int operand2;
int answer;

// Input Step
// Check first input....
flag = int.TryParse(txtoperand1.Text, out operand1);
if (flag == false)
{
MessageBox.Show("Enter a whole number", "Input Error");
txtOperand1.Focus();
return;
}

// Check second input...
flag = int.TryParse(txtOperand2.Text, out operand2);
if (flag == false)
{
MessageBox.Show("Enter a whole number", "Input Error");
txtOperand2.Focus();
return;
}

// Process Step
answer = operand1 / operand2;

//Display Step
txtResult.Text = operand1.ToString() + " divided by " +
operand2.ToString() +
" equals " + answer.ToString();
txtResult.Visible = true;
}


privatevoid Exitbtn_Click(object sender, EventArgs e)
{
Close();
}


}

Hello,
Based on your code it appears as though you have not named one of the textboxes txtOperand1, rather they are named as follows:


Based solely on the code you provided and without ever reading this manuscript my guess would be that textBox1 and textBox2 should be named: txtOperand1 && txtOperand2. This should clear up all of the errors you are having in your code.

FYI: Remember that C# is case sensitive. If you were to change the ID properties of the two textboxes as noted above, you are still going to recieve an error in your code here:


Since txtoperand1 != txtOperand1.

hth.
-Doug

__________________
===============================================
Doug Parsons
Wrox online library: Wrox Books 24 x 7
Did someone here help you? Click on their post!
"Easy is the path to wisdom for those not blinded by themselves."
===============================================

Hi Doug,

Thank you for your very very quck response, your help was spot on.

Now working as it should, appeared as though i hit one of those "DOH!!" moments.

Thanks again
Steve

No problem Steve, glad it worked out for you!

__________________
===============================================
Doug Parsons
Wrox online library: Wrox Books 24 x 7
Did someone here help you? Click on their post!
"Easy is the path to wisdom for those not blinded by themselves."
===============================================