Hi premjit,
You can use Merge Option.
ForExample :
DataTable dt1 = new DataTable();
dt1.Columns.Add("Slno", typeof(string));
dt1.Columns.Add("Type", typeof(string));
dt1.Columns.Add("Variable", typeof(string));
dt1.Columns.Add("Type1", typeof(string));
dt1.Columns.Add("Size", typeof(string));
dt1.Rows.Add("1", "onetype", "aa", "aaa", "aqswwq");
DataTable dt2 = new DataTable();
dt2.Columns.Add("value", typeof(int));
dt2.Rows.Add("100");
DataTable dt3 = new DataTable();
dt3.Merge(dt1);
dt3.Merge(dt2);
Hope diz helps
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