public static void SetHeaderStyle(
StateBag viewState,
DataControlFieldCollection columns,
string AscendingClassName,
string DescendingClassName)
{
SortDirection sortDirection = SortDirection.Ascending;
if (viewState[Const.SortDirection] != null)
{
sortDirection = (SortDirection)viewState[Const.SortDirection];
}
var column = viewState[Const.SortExpression] as string;
if (typeof(BoundField) == columns.GetType())
{
foreach (BoundField field in columns)
{
if (field.DataField == column)
{
field.HeaderStyle.CssClass = sortDirection == SortDirection.Ascending ? AscendingClassName : DescendingClassName;
}
else
{
field.HeaderStyle.CssClass = string.Empty;
}
}
}
}