Supress Postback on an ASP.NET ImageButton

If you are looking to suppress a postback on an imagebutton, then the following code should be helpful:

ASP.NET Image Button

Using MarkUp - Observe the onClientClick event

<asp:ImageButton ID="btnShow" ImageUrl="~/Images/Show.gif" 

runat="server" OnClientClick="return false;" />

Using Code Behind:

C#

    protected void Page_Load(object sender, EventArgs e)

    {

        btnShow.Attributes.Add("onclick", "return false;");

    }

VB.NET

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

        btnShow.Attributes.Add("onclick", "return false;")

    End Sub

HTML Image Button

To prevent postback on an HTML Image button, use the following tag:

    <input type="image" id="imgBtn" 

    onclick="return false;" src="Images/Show.gif" />

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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