Help with updating Datagrid

I have a wierd problem. I have made a copy/paste from one of my programs that finns a datagrid with values from a sql db. And it works fine in that example, but when I use the same code with the oledb and an access db I get an error... here is the code for the updatecommand

PHP Code:

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    protected void DataGrid1_UpdateCommand(object source, DataGridCommandEventArgs e)
        {
                            
            OleDbConnection myConn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\inetpub\\wwwroot\\webreport\\userdb.mdb");
            

            OleDbCommand cmd = new OleDbCommand("Update",myConn);
            cmd.CommandType = CommandType.StoredProcedure;  
            
            
            OleDbParameter param = new OleDbParameter();
            
            
            
            
            string userid = DataGrid1.DataKeys[e.Item.ItemIndex].ToString();
            param = cmd.Parameters.Add("@puserid",OleDbType.varchar);
            param.Direction = ParameterDirection.Input;
            param.Value = userid;
            
            string username = ((TextBox)e.Item.Cells[1].Controls[0]).Text; 
            param = cmd.Parameters.Add("@pusername",OleDbType.VarChar);
            param.Direction = ParameterDirection.Input;
            param.Value = username;
            
            string password = ((TextBox)e.Item.Cells[2].Controls[0]).Text; 
            param = cmd.Parameters.Add("@ppassword",OleDbType.VarChar);
            param.Direction = ParameterDirection.Input;
            param.Value = password;

            string admin = ((TextBox)e.Item.Cells[3].Controls[0]).Text; 
            param = cmd.Parameters.Add("@padmin",OleDbType.Boolean);
            param.Direction = ParameterDirection.Input;
            param.Value = System.Convert.ToBoolean(admin);
            
        



            cmd.Connection.Open();
            cmd.ExecuteNonQuery();
            cmd.Connection.Close();
            DataGrid1.EditItemIndex = -1;
            BindGrid();
            
        } 


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The error occurs on the line

PHP Code:

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            string userid = DataGrid1.DataKeys[e.Item.ItemIndex].ToString(); 


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and the error is:

Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

The only thing I can think of is that primary keys are different in Access and SQL... other than that there is no difference between the code...
The stored procedure looks like:

UPDATE reportusers SET username = [@pusername], [password] = [@ppassword], admin = [@padmin]
WHERE userid=[@puserid];



any help would be nice! This is a wierd problem...


kind regards
Henrik

Double check that you set the datakey property for the datagrid to the correct column.

Hmm, when I made the first example (from which I had borrowed code to this one) I don't recall setting such a property... I assumed it automatically recogniced the db primary key column...? which is the first one...

kind regards
Henrik