How to get the exact "constraint name" from SQLException

Question

Is there a way to get the exact "constraint name"\"index name" from C# "Microsoft SQL Exception", Error number 2601 or 2627, but without parsing the text of the "Message property"?

For example:

catch (SqlException e)
{
   switch (e.Number)
   {
      case 2601:
         /* Here i want to know the constraint name in case i have 
            more than one on a specific table, so i will be able to 
            display the correct error message to the user. 

          For example: 

          case IX_Username:
           throw new Exception("Username duplication")
          case IX_PhoneNumber:
           throw new Exception("PhoneNumber duplication")  

        */
         break;
      default:
         throw;
   }
 }

Answer 1

Use naming convention for constraints e.g. name these to always contain underscore like FK_Xxx or UQ_Xxx then use regex to parse errors for names like this

    var match = Regex.Matches("Foreign key FK_Xxx violation.", @"\b\w*_\w*\b")
        .Cast<Match>().FirstOrDefault();
    return match != null ? match.Value : null;

Answer 2

Is there a way to get the exact "constraint name"\"index name" from C# "Microsoft SQL Exception", Error number 2601 or 2627, but without parsing the text of the "Message property"?

No, there is no such way.