private void gridbind()
 {
     da = new SqlDataAdapter("select Date,UserName,EmailId,feedback from feedback where Date between convert(varchar,'" + TextBox2.Text + "',103) and  convert(varchar,'" + TextBox1.Text + "',102)", con);
     dt = new DataTable();
     da.Fill(dt);
     if (dt.Rows.Count > 0)
     {
         GridViewfeedback.DataSource  = dt;
         GridViewfeedback.AllowPaging = true;
         GridViewfeedback.DataBind();
         Label3.Text = "";
     }
     else
     {
         GridViewfeedback.DataSource  = "";
         GridViewfeedback.AllowPaging = false;
         GridViewfeedback.DataBind();
         Label3.Text = "No Feedback";
     }
 }
    protected void Page_Load(object sender, EventArgs e)
    {
        con = new SqlConnection(ConfigurationManager.AppSettings["con"]);

        if (Page.IsPostBack == false)
        {
            da = new SqlDataAdapter("select Date,UserName,EmailId,feedback from feedback where Date=cast( getdate()as date)", con);
            dt = new DataTable();
            da.Fill(dt);
            if (dt.Rows.Count > 0)
            {
                GridViewfeedback.DataSource  = dt;
                GridViewfeedback.AllowPaging = true;
                GridViewfeedback.DataBind();
            }
            else
            {
                GridViewfeedback.DataSource  = "";
                GridViewfeedback.AllowPaging = false;
                GridViewfeedback.DataBind();
            }
        }
    }