Select only necessary columns from the existing Datatable

For selecting only the necessary columns from the n number of columns on another datatable by using Merge option of the datatable.we can ommit the unwanted columns through MissingSchemaAction.Ignore

For example,
Let existingTable as existing datatable with columns named SNo,Name,Sub1,Sub2,Sub3,Total.But we need only Sno,Name,Total alone into a separate datatable.For this,just simply do the following,

DataTable copiedTable = new DataTable();
copiedTable.Columns.Add("SNo", Type.GetType("System.Int32"));
copiedTable.Columns.Add("Name", Type.GetType("System.varchar"));
copiedTable.Columns.Add("Total", Type.GetType("System.Single"));
copiedTable.Merge(existingTable, true, MissingSchemaAction.Ignore);