Returns the placeholder for the parameter in the associated SQL statement.
      Visual Basic syntax
         
         
            Protected Overrides Function 
            GetParameterPlaceholder
            (ByVal index As Integer)
             As String
         
      
      C# syntax
         
         
            protected override string 
            GetParameterPlaceholder
            (int index)
         
      
      Parameters
         
         
            - 
               index – 
               The number to be included as part of the parameter's name.
            
 
         
       
      Returns
         The name of the parameter with the specified number appended.