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

Question

Dear all i have totally four textboxes its allowing only double datatype values while iam starting enter the values from first textbox onwords i want to disply the sum in the down lable but this was in c# only dont need in javascript and j query and after entering the first value and iam started to enter the second textbox value but i want sum update so help me please

Ramchand Repalle · Answer

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(); }

Prasad Bhagat · Answer

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

Ramchand Repalle · Answer

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