DataGrid Updation Problem !!

Hello all


i am trying to update the database with the DataSet (Updated from the DataGrid) but it is giving the error as


"Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information."


the code is as follows








public DataSet bindControlToGrid(DataSet dataSet)


{


SqlConnection objConn= null;


SqlCommand objComm = null;


try


{


objConn = new SqlConnection(@"User ID=sa;Password=sa;database=ExtraNet;server=EAGLESEAGLES");





SqlDataAdapter objAdapter=new SqlDataAdapter();


objAdapter.SelectCommand= new SqlCommand("SELECT sUserID,sUserName FROM tblUser WHERE dUserDeActivated IS NULL ORDER BY sUserName,nUsrSerialNo",objConn);


SqlCommandBuilder sqlCommandBuilder = new SqlCommandBuilder(objAdapter);


objConn.Open();


DataSet objdataSet= new DataSet("ko");


string d = (dataSet.Tables[0].Rows[0].ItemArray.GetValue(0).ToString());





objAdapter.Fill(objdataSet);


objAdapter.Update(dataSet);


objAdapter.Dispose();


}


catch(Exception ex)


{


string s= ex.Message;


}


finally


{


//objComm.Dispose();


objConn.Close();


}


return dataSet;


}





kindly help