for example:

before sorting: 90

                     98

                     51

                      978

after sorting:51

                     90

                     978

                      98

 It sounds like data type for that colums is String and sorting is performed for strings.

Try to set numeric type.

Alex. 

hi

thanks a lot

1. Create  comparer. 

  private class CustomComparer : IComparer
        {
            int IComparer.Compare(object x, object y)
            {
                UltraGridCell xCell = (UltraGridCell)x;
                UltraGridCell yCell = (UltraGridCell)y;

                double val1;
                double val2;
                double.TryParse(xCell.Value.ToString(), out val1);
                double.TryParse(yCell.Value.ToString(), out val2);

                return val1.CompareTo(val2);
            }

 2. Set it to column:

           UltraGridColumn valueCol = grid_.DisplayLayout.Bands[0].Columns["Value"];
            valueCol.SortComparer = new CustomComparer();
 

See small attached project for more details. Column "Value" has string type but it's sorted as numeric.

Alex. 

pleaze help me for using a Sortcomparer by example

thanks

Yeah, Alex is right. Your column must be storing numeric values in a String column. So the strings gets sorted alphabetically instead of numerically. You should make sure the column is a numeric type. Or, if that's not possible, you can use a SortComparer to convert the strings to numbers and sort them that way.