Introduction
In this article
we are going to learn the topic of how to post back the dropdown selected
change without changing the property of Autopostback=”true”
.
For this we are going to call the method at the
time of onchange event OnChange="dropDownChange();"
In this method we write the call back method with
parameter condition like
__doPostBack('pnlGrid', strUser)
Coding
Write this code
In Aspx Source File
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.style1
{
width: 100%;
}
</style>
<script type="text/javascript">
function dropDownChange()
{
var e
= document.getElementById("<%=DropDownList1.ClientID%>");
var strUser
= e.options[e.selectedIndex].value;
__doPostBack('pnlGrid', strUser)
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<asp:UpdatePanel ID="asdasd" runat="server">
<ContentTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" OnChange="dropDownChange();">
</asp:DropDownList>
<asp:Panel ID="pnlGrid" runat="server" OnLoad="pnlGrid_Load">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="UserId" />
<asp:BoundField DataField="UserName" />
<asp:BoundField DataField="Education" />
</Columns>
</asp:GridView>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
Write this code in the .CS file
using System;
using System.Data;
using System.Web.UI.WebControls;
namespace SampleTestingCodes
{
public partial class BindTheGridFromDropDownWithOutPostBack : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DropDownList1.Items.Add(new ListItem("One", "1"));
DropDownList1.Items.Add(new ListItem("Two", "2"));
DropDownList1.Items.Add(new ListItem("Three", "3"));
DropDownList1.Items.Add(new ListItem("Four", "4"));
DropDownList1.Items.Add(new ListItem("Five", "5"));
}
}
protected void pnlGrid_Load(object sender, EventArgs e)
{
string parameter
= Request["__EVENTARGUMENT"];
if (!string.IsNullOrEmpty(parameter))
{
DataTable dt
= new DataTable();
dt.Columns.Add("UserId", typeof(int));
dt.Columns.Add("UserName", typeof(string));
dt.Columns.Add("Education", typeof(string));
dt.Rows.Add(1, "Lokesh", "B.Tech");
dt.Rows.Add(2, "Vijay", "Msc");
dt.Rows.Add(3, "Balaji", "MS");
dt.Rows.Add(4, "Charan", "B.Tech");
dt.Rows.Add(5, "Durga", "MD");
dt.Rows.Add(6, "Shiva", "B.Tech");
dt.Rows.Add(7, "Venkat", "CA");
var results
= (from myRow in dt
.AsEnumerable()
where myRow.Field<int>("UserId") == Convert.ToInt16(parameter)
select myRow).CopyToDataTable();
GridView1.DataSource = results;
GridView1.DataBind();
}
}
}
}
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