Gridview-Grouping Data

[icanhelp33]

I am using a method to group data in Gridview. I am able to compare
one sortexpression with the gridview field. I would also like to
compare sortexpression2 with another gridviewfield. How is that
possible.

For example: GridView has FirstName,LastName,City

I would like to compare "FirstName" & "LastName" then set flag only
when both conditions are met.

private bool _SortedFlag = false;
private int _SortColumnIndex = -1;
private string _SortColumnHeader = "";

private void ResolveGroupingData(string sortExpression1, string
sortExpression2)
{
foreach (DataControlField field in gridCustomer.Columns)
{
if (field.SortExpression == sortExpression1)
{
_SortedFlag = true;
_SortColumnIndex =
gridCustomer.Columns.IndexOf(field);
_SortColumnHeader = field.HeaderText;
break;
}
}
}