Multiple form submits can result difficulties in web applications because of unexpected behaviors like multiple entries in database. Here is a solution to help you avoid multiple submits.
If you are submitting the page only once then you can use,
<span><</span>form onsubmit="return Submit();"><br />
And the method is like,
<span style="FONT-STYLE:italic;"><span><</span>script type="text/javascript"><br />var flag = false;<br /><br />function Submit()<br />{<br /> if (flag)<br /> {<br /> return false;<br /> }<br /> else<br /> {<br /> flag = true;<br /> return true;<br /> }<br />}<span><br /><</span>/script></span><br />For a single button you can use,
btnSubmit.Attributes["onclick"] = "this.disabled=true;" +<br />GetPostBackEventReference(btnSubmit);
For pages with update panels multiple submit is a real problem as page is posting asynchronously or partially.In that scenario you can use Sys.WebForms.PageRequestManager for fixing the issue,
<span style="FONT-STYLE:italic;"><span><</span>asp:ScriptManager ID="ScriptManager1" runat="server"><br /><span><</span>/asp:ScriptManager><br /><br /><span><</span>script type="text/javascript"><br /><br />Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequest);<br /><br />function BeginRequest(sender, e)<br />{<br /> e.get_postBackElement().disabled = true;<br />}<br /><br /><span><</span>/script></span>
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