Sorry, that was a mistake on my part. The Compare method will be passed instances of UltraGridCells to compare, not strings. Change the Compare method to the following:

public int Compare(object x, object y)
{
UltraGridCell xCell = (UltraGridCell)x;
UltraGridCell yCell = (UltraGridCell)y;
string strX = xCell.Value.ToString();
string strY = yCell.Value.ToString();

return _gradeTypes.IndexOf(strX) - _gradeTypes.IndexOf(strY);
}

Thanks  a lot for the help

I got it this Way and it worked out.

 

public class GradeTypeComparer : IComparer
{
private List<string> _gradeTypes = new List<string>(new string[ { "A", "R", "B" });

public GradeTypeComparer()

{

}
public int Compare(object x, object y)
{
UltragridCell xCell= (UltraGridCell)x;

UltragridCell  yCell = (UltraGridCell)y;

return _gradeTypes.IndexOf(xCell.Value.ToString()) - _gradeTypes.IndexOf(yCell.Value.Tostring());
}
}
 

 

Thanks
kartik