Using Gridview To Update And Delete The Columns - Getting An Error?

Mar 9, 2011

Am running asp.net application with c#.Am using gridview to update and delete the columns.deleting is working fine.if am clicking the update button i got

System.NullReferenceException: Object reference not set to an instance of an object.

My code is;

protected bool IsRowModified(GridViewRow row)
{
int currentID;
string currentName;
string currentLocation;
currentID = Convert.ToInt32(GridView1.DataKeys
[row.RowIndex].Value);
currentName = ((TextBox)row.FindControl
("txtName")).Text;
currentLocation = ((TextBox)row.FindControl
("txtLocation")).Text;......

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