How to put one dataset into another dataset.

 Using Merge mathod , you can convert to two datasts to one

as

 

DataTable dt = new DataTable("Table");

dt.Columns.Add("Clm");

DataSet ds = new DataSet();

ds.Tables.Add(dt);

dt = new DataTable("Table1");

dt.Columns.Add("Clm1");

DataSet ds1 = new DataSet();

ds1.Tables.Add(dt);

ds1.Merge(ds);