How to put two DataSets in single DataSet?

Specifies how to read XML data and a relational schema into a DataSet.

Using Merge Method , you can do as

DataTable dt = new DataTable("Table");

dt.Columns.Add("Clm");

DataSet ds = new DataSet();

dt = new DataTable("Table1");

dt.Columns.Add("Clm1");

DataSet ds1 = new DataSet();