How to add dummy data to datatable with multiple columns

 DataTable dt = new DataTable("DummyData");

        dt.Columns.Add("Id", typeof(int));

        dt.Columns.Add("Name", typeof(string));

        dt.Columns.Add("City", typeof(string));

        DataTable dt1 = new DataTable("DummyData");

        dt1.Columns.AddRange(new DataColumn[] {

        new DataColumn("Id", typeof(int)),

        new DataColumn("Name", typeof(string)),

        new DataColumn("City", typeof(string))

    });

        dt.Rows.Add(1, "John Doe", "New York");

        dt.Rows.Add(2, "Jane Smith", "London");

        dt.Rows.Add(3, "Peter Jones", "Paris");

//or

 //  DataRow newRow = dt.NewRow();

    newRow["Id"] = 4;

   // newRow["Name"] = "Alice Brown";

    //newRow["City"] = "Tokyo";

    //dt.Rows.Add(newRow);

        GridView1.DataSource = dt;

        GridView1.DataBind();