DataTable Helper Class for C#

First, the original intention of the DataTable helper class

Usually in the development of C# projects, we often involve the operations of the DataTable data type, such as the need to convert entities and DataTables to each other, merge two DataTables, and add, remove, and obtain DataTable tables.It can only be used after testing and learning. Here is a help class about the DataTable data type, which is convenient and fast for developers to use.

Second, the function of the DataTable helper class

* Function:
* 1. Convert DataTable to entity
* 2. Convert entity to DataTable
* 3. Merge two DataTables with different columns into a new DataTable
* 4. Operation of DataTable
* 1-Copy DataTable
* 2-Add fields to DataTable
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* 5-Add two columns to the Datatable
* 6-Add the List content to the DataTable (add a data row)
* 7-Add a piece of data to the specified row of the DataTable
* 8-DeleteThe data at the beginning of and after the specified row of Datable
*       9-Get all the field names of the DataTable (through the entity model)
*        10-Get the data of the specified row and column in the DataTable
*         12-get the specified columnMultiple rows of data
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