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. 

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. 

pleaze help me for using a Sortcomparer by example

thanks

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.