Object reference not set to an instance of an object.

[askardn]

can anyone solve this,, more details chek the image

 

Line 852: CheckBox CBX1 = ((CheckBox)grid_add_contacts_list.Rows[rowindex].FindControl("cbk_edit_cprimary"));

Line 853:

Line 854: CBX1.Checked = true;

Line 855:

Line 856: }

 

 

error Line: 854

[PlausiblyDamp]

It looks as though

CheckBox CBX1 = ((CheckBox)grid_add_contacts_list.Rows[rowindex].FindControl("cbk_edit_cprimary"));

isn't returning a valid object, are you sure the control has that id and is present in the row?