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how to slove this problam
if (e.CommandName == "Update")
        {
            GridViewRow gvrow = (GridViewRow)((ImageButton)e.CommandSource).NamingContainer;
            TextBox txtbarndFaName = (TextBox)gvrow.FindControl("TFBrandFaNameedit");
            TextBox txtbarndEnName = (TextBox)gvrow.FindControl("TFBrandEnNameedit");
            DropDownList txttypepartEnName = (DropDownList)gvrow.FindControl("DDTypehardware");
            int a = int.Parse(txttypepartEnName.SelectedValue);
            SqlDupdate.UpdateParameters["FBrandFaName"].DefaultValue = txtbarndFaName.Text;
            SqlDupdate.UpdateParameters["FBrandEnName"].DefaultValue = txtbarndEnName.Text;
         SqlDupdate.UpdateParameters["FPartCatID"].DefaultValue = txttypepartEnName.SelectedValue.ToString();
                
            SqlDupdate.Update();      
        }

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

DropDownList txttypepartEnName = (DropDownList)row.FindControl("DDTypehardware

the type filed db is smallint.
how to convert SqlDupdate.UpdateParameters["FPartCatID"].DefaultValue = txttypepartEnName.SelectedValue.ToString();

to int.
Posted 11-Nov-12 5:10am

1 solution

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Solution 1

Check if your control is null before moving into the update.Its possible there is a row in your grid with a control that is null, so txttypepartEnName is null at some point.
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Comments
saeed1364 at 11-Nov-12 12:41pm
   
iam check. contorl is not null

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