Add / Insert Identity column to DataTable in asp.net C#

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DataTable dt = new DataTable();

        //Add columns to DataTable.

        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id"), new DataColumn("Name"), new DataColumn("Country") });

        //Set AutoIncrement True for the First Column.

        dt.Columns["Id"].AutoIncrement = true;

        //Set the Starting or Seed value.

        dt.Columns["Id"].AutoIncrementSeed = 1;

        //Set the Increment value.

        dt.Columns["Id"].AutoIncrementStep = 1;

        //Add rows to DataTable.

        dt.Rows.Add(null, "Raja", "India");

        dt.Rows.Add(null, "Ram", "US");

        dt.Rows.Add(null, "Mohan", "UK");

        dt.Rows.Add(null, "Ray", "Russia");

        dt.Rows.Add(null, "Jai", "China");