How to update specific cell in grid View?

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Hai Sir,

I have a Grid view with 8 columns. When I update the specific column in Grid View cell, it is updated but in My Database the remaining all columns shows as NULL values.

How can I rectify this problem? and I want to update only that particular cell and the remaining cells should have old data.
Thanks in Advance..

Posted 27-May-15 20:18pm

Kanaparthi Sureshma Reddy

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Abhipal Singh 28-May-15 2:30am

Can you post your Update query?
and some code as well.

Sinisa Hajnal 28-May-15 2:49am

Please move this into the question via Improve question link. Do NOT post code in comments. Thank you.

Sinisa Hajnal 28-May-15 2:52am

Also, NEVER use user input directly in your query, use parametrized query or stored procedure. Try entering: " '; DROP student_sub; -- " (without quotes) into sname field and see why you shouldn't. It is called SQL Injection (google it).

Also, consider using String.Format instead of concatenation.

As for this problem: set a breakpoint on String sid = ... and debug from there, you'll see which variable creates problem.

Sergey Alexandrovich Kryukov 28-May-15 2:32am

Grid view? Which one? Full type name, please.
—SA

Sinisa Hajnal 28-May-15 2:48am

And add technology tag, is this WPF? Winforms? asp.net? What?

[no name] 28-May-15 3:02am

please post your code for better understanding!!!

Kanaparthi Sureshma Reddy 28-May-15 3:30am

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
String sid = GridView1.DataKeys[e.RowIndex].Value.ToString();
String sname = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox2")).Text;
String ac = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox3")).Text;
String dc = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox4")).Text;
String ss = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox5")).Text;
String oc = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox6")).Text;
String cn = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox7")).Text;
String co = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("TextBox8")).Text;
con.Open();
string q = "update student_sub set ac='" + ac + "',dc='" + dc + "',ss='" + ss + "',oc='" + oc + "',cn='" + cn + "',co='" + co + "' where stud_id='" + sid + "' ";
SqlCommand cmd = new SqlCommand(q, con);
cmd.ExecuteNonQuery();
con.Close();
GridView1.EditIndex = -1;
Bind_Grid();
}

[no name] 28-May-15 5:00am

u have to put some conditions over there using if statement , for eg. if u update only "ac" then firstly at page load save value of "ac" from gridview(before updating) in a variable(OldValueAC) then in RowUpdating event ur getting updated vaule of "ac" (NewValueAC) so now just check both OldValueAC and NewValueAC are different then only update it

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