Manage/ManageClass.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class Manage_ManageClass : System.Web.UI.Page
{
    SqlConnection con = DB.getcon();
    DataSet ds = new DataSet();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.GridBind();
            TextBox1.Text ="";
        }

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (TextBox1.Text =="")
            this.Label1.Visible=true;
        else
        {
            string mclass = this.TextBox1.Text.Trim();
            con.Open();
            SqlCommand cmd = new SqlCommand("insert into Categories (CatName) values('" + mclass + "')", con);
            try { cmd.ExecuteNonQuery(); }
            catch (Exception e1)
            {
                Response.Write(e1.Message);
            }
            con.Close();
            this.GridBind();
            this.TextBox1.Text = "";

        }

    }
    public void GridBind()
    {
        SqlDataAdapter sda = new SqlDataAdapter("select * from Categories", con);
        sda.Fill(ds, "mclass");  
        this.GridView1.DataSource = ds.Tables["mclass"].DefaultView;
        this.GridView1.DataBind();
    }
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        this.GridView1.EditIndex = -1;
        this.GridBind();

    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {