QueryableExtensionMethodsCountColumn Method | 
| Name | Description | |
|---|---|---|
| CountColumnTSource, TColumnType(IQueryableTSource, ExpressionFuncTSource, TColumnType) | 
            returns the number of values in the set specified by selector which is 1 column wide.
              | |
| CountColumnTSource, TColumnType(IQueryableTSource, ExpressionFuncTSource, TColumnType, Boolean) | 
            returns the number of distinct values in the set specified by selector which is 1 column wide
              |