Gridview edit delete cs page

default.aspx.cs page:
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

public partial class Admin_Updatedoctors : System.Web.UI.Page
{
    BAL bal = new BAL();
    DataSet ds = new DataSet();
    protected void Page_Load(object sender, EventArgs e)
    {
        Binddata();
    }
    protected void Binddata()
    {
        try
        {
            ds = bal.getdoctors();
            gvdisplay.DataSource = ds;
            gvdisplay.DataBind();

        }
        catch (Exception ex)
        {
            lblerrmsg.Text = ex.Message;
        }
    }
    protected void gvdisplay_Click(object sender, GridViewCommandEventArgs e)
    {
        try
        {
            Int64 str = Convert.ToInt64(e.CommandArgument);
            if (e.CommandName == "Eedit")
            {
                ds = bal.getsingledoctor(str);
                txtdoctorid.Text = ds.Tables[0].Rows[0][0].ToString();
                txtname.Text = ds.Tables[0].Rows[0][1].ToString();
                txtspecialisation.Text = ds.Tables[0].Rows[0][2].ToString();
                txtphonenumber.Text = ds.Tables[0].Rows[0][3].ToString();
                txtemail.Text = ds.Tables[0].Rows[0][4].ToString();
                txtcity.Text = ds.Tables[0].Rows[0][5].ToString();
                txtstate.Text = ds.Tables[0].Rows[0][6].ToString();
                txtcountry.Text = ds.Tables[0].Rows[0][7].ToString();
                txtgender.Text = ds.Tables[0].Rows[0][8].ToString();
                updatepnl.Visible = true;

            }
            else
            {
                lblerrmsg.Text = "cant edit";
            }

          

        }
        catch (Exception ex)
        {
            lblerrmsg.Text = ex.Message;
        }

    }
}