C# how to auto populate data to a 3rd textbox

Question

0.00/5 (No votes)

See more:

I have look over the net but cant find an answer to a simple question. I have 3 textboxs
for math TB1 12 * TB2 12 = TB3 (144). when I type the numbers into text 1 and 2 I want it to show in textbox3 without Buttons.

any links would be helpful

Thanks

What I have tried:

C#

int res = 0;
           try
           {
               res = Convert.ToInt32(tbLength.Text) * Convert.ToInt32(tbWidth.Text);
               textBox2.Text = res.ToString();
           }
           catch (Exception ) { }

Posted 28-Jan-17 14:06pm

Member 12349103

Updated 29-Jan-17 6:19am

v2

Add a Solution

Comments

[no name] 28-Jan-17 20:13pm

The simple answer to your simple question is use the text changed event.

4 solutions

Solution 4

Thanks Guys That help me a lot.

Posted 29-Jan-17 6:19am

Member 12349103

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2017-01-28T17:25:00

Solution 2

Just handle the text change event. Inside that do your calculations and show in another textbox.

Posted 28-Jan-17 17:25pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

User 7407470 · Accepted Answer · 2017-01-28T17:39:00

As the others already stated, you can use the TextChanged event of the textboxes.
Here's an (WinForms) example of how to do that:

C#

public Form1()
{
    InitializeComponent();

    tbWidth.TextChanged += tbWidthLength_TextChanged;
    tbLength.TextChanged += tbWidthLength_TextChanged;
}

private void tbWidthLength_TextChanged(object sender, EventArgs e)
{
    int width, length;

    int.TryParse(tbWidth.Text, out width);
    int.TryParse(tbLength.Text, out length);

    textBox2.Text = (width * length).ToString();
}

Peter

Mizanur Rahman · Accepted Answer · 2017-01-28T16:55:00

Solution 1

try
{
decimal Length= = Convert.ToDecimal(tbLength.Text);
decimal Width= = Convert.ToDecimal(tbWidth.Text);

decimal res = Length * Width;
textBox2.Text = res.ToString();
}
catch (Exception )
{ }

Posted 28-Jan-17 16:55pm

Mizanur Rahman

v2