how to display a value in a combobox depending on the selected value from another combobox

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C#

ASP.NET

SQL

SQL-Server-2008

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I would like to display a value in a combo box which is read only on grid edit command. The value depends on the selected value of another combo box.
I am doing something like this by using enum, but it is not working?

if (cmbIncidentOutcome.SelectedValue.Split(SysXConsts.HYPHEN)[SysXConsts.ONE].Equals(IncidentOutComeContext.SUPPLIERNOTICE.GetStringValue()))
                   {
                      
                       cmbIncidentStatus.ClearSelection();
                       cmbIncidentStatus.SelectedValue = IncidentStatusContext.INCIDENTCLOSED.GetStringValue();
                   }