How to compare two datatable columns names

I do not under stand your query means do not understand table1 column

Having the string collection as

   StringCollection lsttable1ColumnValues = new StringCollection();
        StringCollection lsttable2ColumnValues = new StringCollection();

Add that particular column values to the list

 //Add the table 1 value in the list
        foreach (DataRow drTable1 in dtTable1.Rows)
        {
            lsttable1ColumnValues.Add(drTable1["Column1"].ToString());
        }

        foreach (DataRow drTable1 in dtTable1.Rows)
        {
            lsttable2ColumnValues.Add(drTable1["Column1"].ToString());
        }

Now u can compare the list that are common in the two list and achieve what u want.

Thanks