Update , Delete inside the grid view

//Take one Grid View and Bind all Column and take column inside templatefiels inside ItemTemplate and EditItemTemplate ALSO FOR Generate text box for updation
I have remove starting tag from the Html Tag because blog can't take Html field like Starting tag .....


asp:Label ID="lblId" runat="server" Visible="false" Text='%# Bind("Id") %>'>/asp:Label>



//Web.config file
add name="Master" connectionString ="Data Source=.;user id=; password=; database=Master; "/>


//aspx.cs

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Master"].ConnectionString);
SqlDataAdapter adp;
DataSet ds; SqlCommand cmd;


void fillgridview()
{
adp = new SqlDataAdapter("Select a.id,a.Name,a.Age,a.RollNo,b.Subject from student a join subject b on a.subjectid=b.subjectid", con);
ds = new DataSet();
adp.Fill(ds);
if (ds.Tables[0].Rows.Count > 0)
{
GridView1.DataSource = ds.Tables[0];
GridView1.DataBind();

}
else { }
ds.Dispose();
adp = null;

}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
fillgridview();
}
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
Label lbnlid = (Label)GridView1.Rows[e.RowIndex].FindControl("lblId");

con.Open();
cmd = new SqlCommand("delete from student where id= " + lbnlid.Text + " ", con);
cmd.ExecuteNonQuery();
con.Close();

GridView1.EditIndex = -1;
fillgridview();
}
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
fillgridview();
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
fillgridview();
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
TextBox txtName = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtName");
TextBox txtCity = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtCity");
Label lbnlid = (Label)GridView1.Rows[e.RowIndex].FindControl("lblId");

con.Open();
cmd = new SqlCommand("update student set Name= '"+txtName.Text +"' where id= "+lbnlid.Text+" ", con);
cmd.ExecuteNonQuery();
con.Close();


GridView1.EditIndex = -1;
fillgridview();
}