I want to Union two Data Table, File 1 and File 2. These two data tables have Field names where few of them are same and few of the field names are not. Now the union of the two tables should be such as the common field name should come in the same Vertical column but for both tables the header should be present as shown in the sample Output. The basic moto is to compare the data of File 1 and File 2 and calculate the difference of the Hours Given.