Load DataSet From SqlDataReader And Fill GridView

using System.Data;
using System.Configuration;
using System.Data.SqlClient;
protected void Page_Load(object sender, EventArgs e) {
    datareaderuse();
}
protected void datareaderuse() {
    using(SqlConnection con = new SqlConnection("Data Source=LAPTOP6\\MSSQLSERVER2014;Initial Catalog=SEPTNEW;Integrated Security=True;")) {
        using(SqlCommand cmd = new SqlCommand("Select * from City_Master")) {
            cmd.Connection = con;
            con.Open();
            using(SqlDataReader sdr = cmd.ExecuteReader()) {
                //Create a new DataSet.
                DataSet dsCustomers = new DataSet();
                dsCustomers.Tables.Add("City_Master");
                //Load DataReader into the DataTable.
                dsCustomers.Tables[0].Load(sdr);
                GridView1.DataSource = dsCustomers.Tables[0];
                GridView1.DataBind();
            }
        }
    }
}