When you create data-table you can choose the data type of each column.

Thanks Mr.Vehbi Neziri for your answer, actually I have new algorithm for sorting integer number and I want test it with standard dataset. I don't need to create my own dataset

While reading the data-set you can convert to integer, where column and row can be changed through a loop.

Example:

intNum= int.Parse(dt.Rows[0][0]);