code for getting already selected row in gridview

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my gridview consist of a textbox of totalmarks
below gridview i have an textbox named txttotal
for an eg, there are 5 rows in gridview.
if a value is entered in totalmarks, automatically same value should get displayed in txttotal textbox.
if 2nd value is entered total of 2 txtboxes should beg displayed in txttotal textbox and it goes on.
My code is :

C#

if (gridviewrowcount == 0)
                txttotal.Text = totalmarks.Text;
            else
               txttotal.Text = (Convert.ToDouble(txttotal.Text) + Convert.ToDouble(totalmarks.Text)).ToString();

It works but when user changes the first or previous textbox value from 140 to 160, then new value also gets added in txttotal textbox, i want to replace the old value. how to find if user is selecting the particular row for 2nd time.. help me...

Posted 1-Apr-13 21:10pm

sukumari1

Updated 1-Apr-13 21:28pm

Pallavi Waikar

v2

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vijay__p · Answer 1 · 2013-04-01T21:45:00

You can try with below

On TextChanged Event Iterate through all GridViewRow and do summation of all txtmarks textbox value and final value should be assigned to txttotal.

C#

double sum = 0;
                foreach (GridViewRow item in GridView1.Rows)
                {
                    var txt = item.FindControl("txtmarks") as TextBox;
                    sum += Convert.ToDouble(txt);
                }

                txttotal.Text = sum.ToString();

or you can use jQuery to get values from textbox and do summation using jQuery selectors.