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OnClIck in Javascript Not Working For Image

I have OnClick Function and On ClientClick Function as
<asp:ImageButton ID="imgbtnSchedule" runat="server" ClientIDMode="Static" ImageUrl="~/images/Update2.png" ToolTip="Refresh" OnClick="imgbtnSchedule_Click" OnClientClick="return validateUpdate(1);" />
My OnClick Function Is Not Working so I Started Debugging using F12. but Here I can see my OnClick function Is Not there and Onclientclick property is showing as OnClick.

I have Onlick Function On Server side and An OnClientClick Function On
client side,I am expecting Ececution Of both OnClick and
OnClientClick,How To Achive this
base on that code
<asp:ImageButton ID="imgbtnSchedule" runat="server" ClientIDMode="Static" ImageUrl="~/images/Update2.png" ToolTip="Refresh"
OnClick="imgbtnSchedule_Click"
OnClientClick="return validateUpdate(1);" />
If the validateUpdate(1) returns false, then the imgbtnSchedule_Click will not called.

C# .NET OnClientClick returning true but OnClick not firing

I have the following code:
<asp:Button ID="btnHideDep" runat="server" Text="Remove this institution" CssClass="link1 small" OnClientClick="return confirm('Confirm remove?');" OnClick="btnHideDep_Click"/>
This button does not fire btnHideDep_Click when OK is pressed in the confirm box.
More interestingly, if i have OnClientClick=return true; the method btnHideDep_Click is still not fired. Also just to confirm, without the property OnClientclick, btnHideDep_Click is fired properly.
I read a few posts about this and it seems like this should work. So I must be missing something very basic here...

Try
OnClientClick="if (!confirm('Confirm remove?')) return false;"

How to set the OnClientClick value - syntax?

ASP.NET coding in VB.NET -- web application.
I am asking a few questions about the "proper way" to set the OnClientClick phrase in the aspx button declaration.
Option 1: leading with 'javascript:' and surrounding the js in {...}
<asp:Button ID="btnDelete" runat="server" CausesValidation="False" SkinID="cmdButton" style="margin-left: 2em;"
CommandName="Delete" Text="Delete"
OnClientClick = "javascript:{(!confirm('Do you want to delete this record?'); return false;}"
Option 2: Not leading with 'javascript:' and NOT surrounding the js in {...}
<asp:Button ID="btnDelete" runat="server" CausesValidation="False" SkinID="cmdButton" style="margin-left: 2em;"
CommandName="Delete" Text="Delete"
OnClientClick="if (!confirm('Do you want to delete this record?')) return false;"
Both options appear to work properly in IE-10, but have not tried other browsers. So I am curious about the different phrases.
What about the leading of 'javascript:'? -- what affect does this have?
What about the surrounding of the js with {...} -- what affect does this have?
Your comments are welcome -- what is the best way to construct the phrase.
Any other syntax (or style) or suggestions will be welcome.
Thanks, in advance...John

OnClientClick renders into the standard HTML onclick attribute, so put whatever works with it.
I.e. - no javascript prefix required, no brackets required as well.

Show confirmation and redirection on same time

I have few questions,
I want to show the alert window on my Update record button click.But
i already i have onClientClick event set for button.So is there
any other way to do that.
Using Response.Write() can i do some thing which is show me
message of updation as well as redirect to my other page.
Can i use ClientScript.RegisterStartupScript methode to do that
functionality? and how
thanks in advance

use OnClientClick and confirm() js
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" OnClientClick="return confirm('Are You Sure You Want to Update?')" />

<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" OnClientClick="return Validate()" />
<script>
function Validate()
{
//do validation here
if(notPassValidation)
{
alert(validationMessage);
return false;
}
//valifation passed, do confirmation
if(!confirm('Are You Sure You Want to Update?') )
{
return false;
}
else
{
return true;
}
}
</script>

I solved this question by handling the client and server events :)
thanks for all response.

asp button and history back onclientclick

hi I have an asp button which is created using the following code:
<asp:Button ID="btnBack" OnClientClick='javascript:history.back()' runat="server" Text="back">
</asp:Button>
However, now the javascript doesn't work to go a history back. On the other hand, if I make an alert() it works...why. Why is it not working to go a history back?

Try with return false at end:
<asp:button id="btnBack" runat="server" text="Back"
OnClientClick="JavaScript: window.history.back(1); return false;"></asp:button>

Try:
parent.history.back();
Or
history.go(-1)

Had the same problem in DevExpress project. Using ASPxButton without initializing the property "AutoPostBack" will result in redirect to self page before any client-side function call.
Try AutoPostBack="false" for the button.