Supress Postback on an ASP.NET ImageButton

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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, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.