data is not display in the form

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ASP.NET

SqlConnection sc = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["hospitalmanagementdb"].ToString());
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "select * from patient where patient_id= " + Request.QueryString["id"].ToString();
cmd.Connection = sc;
sc.Open();
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
sc.Close();

txtFirstnm.Text = sdr[1].ToString();
txtLastnm.Text = sdr[2].ToString();
RadioMF.Text = sdr[3].ToString();
txtAge.Text = sdr[4].ToString();
txtContact.Text = sdr[5].ToString();
txtEmail.Text = sdr[6].ToString();
txtAddress.Text = sdr[7].ToString();