How to calculate sum of running textbox values in asp.net?

TextBox1_TextChanged is the event from c# code only.

You can use this event in C# windows or C# web applications in both.

Sample code should look like below for c# windows application.


  private void textBox1_TextChanged(object sender, EventArgs e)
  {
  double txt1Value, txt2Value, total;
  total = 0;
  double.TryParse(textBox1.Text, out txt1Value);
  double.TryParse(textBox2.Text, out txt2Value);
  total = txt1Value + txt2Value;
  label1.Text = total.ToString();
  }

For C# web application code

  protected void TextBox1_OnTextChanged(object sender, EventArgs e)
  {
  double txt1Value, txt2Value, total;
  double.TryParse(TextBox1.Text, out txt1Value);
  double.TryParse(TextBox2.Text, out txt2Value);
  total = txt1Value + txt2Value;
  lblDisplay.InnerText = total.ToString();
  }

Dear sir thanks for ur responce but my question is like bellow only

iam asking for this calculation but in c# not in java script and jquery

As you need this only in c#, you can achieve by implementing text changed event for all the textboxes.

In that event sum up the other values (If textbox value is empty consider it as zero)

http://asp-net-example.blogspot.in/2009/03/how-to-use-ontextchanged-event-in.html

Thanks,
Ramchand