Delete records in a data grid.

[sana krishna]

when I click the delete button ,display an error.
object reference not set to an instance of an object..
My code..
I use ASP.NET 2.0 (C#) and oracle
public void DeleteStore(Object sender, EventArgs e)
{
string dgIDs = "";
bool BxsChkd = false;
foreach (DataGridItem i in MyDataGrid.Items)
{
CheckBox deleteChkBxItem = (CheckBox)i.FindControl("DeleteThis");
if (deleteChkBxItem.Checked)
{

BxsChkd = true;
dgIDs += ((Label)i.FindControl("Label1")).Text.ToString() + ",";
}

}
string deleteSQL = "DELETE from employ_det WHERE emp_no =(" + dgIDs.Substring(0, dgIDs.LastIndexOf(",")) + ")";
if (BxsChkd == true)
{
try{}
catch (OleDbException err)
{
}

BindData();

}

}