How to refresh an ASP.NET GridView automatically at regular intervals

A common requirement is to refresh the GridView after regular intervals. ASP.NET contains the Timer control which comes in very handy to achieve such requirements. Here's how to do so:

Add the GridView and the Timer control inside an ASP.NET AJAX UpdatePanel as shown below :

<asp:UpdatePanel ID="UpdatePanel1" runat="server">

<ContentTemplate>

<asp:Timer ID="Timer1" runat="server" Interval="3600" ontick="Timer1_Tick"></asp:Timer>

<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" DataKeyNames="CustomerID"

DataSourceID="SqlDataSource1" AllowPaging="True" AllowSorting="True">

<Columns>

<asp:BoundField DataField="CustomerID" HeaderText="CustomerID" ReadOnly="True" SortExpression="CustomerID" />

<asp:BoundField DataField="CompanyName" HeaderText="CompanyName" SortExpression="CompanyName" />

<asp:BoundField DataField="ContactName" HeaderText="ContactName" SortExpression="ContactName" />

<asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" />

<asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />

</Columns>

</asp:GridView>

</ContentTemplate>

</asp:UpdatePanel>

Then in the code behind, add the following code which refreshes the GridView after every minute

C#

protected void Timer1_Tick(object sender, EventArgs e)

{

GridView2.DataBind();

}

VB.NET

Protected Sub Timer1_Tick(ByVal sender As Object, ByVal e As EventArgs)

GridView2.DataBind()

End Sub

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About The Author

Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

Follow him on twitter @suprotimagarwal