Capture User Input And Then Tried To Save Them In Database And Also Trying To Post Them Onto Another Page?

On my aspx page I am trying to capture user input and then tried to save them in database and also trying to post them onto another page. Now I am using the following code on the button click event:ASPX CODE:

<asp:Button runat="server" ID="cmdPress" Text="Save"
ValidationGroup="ValidateId" Height="26px" onclick="cmdSave_Click"/>

CODE BEHIND:

SaveCustomer();
SaveRequest();
cmdPress.Attributes.Add("onClick", "update(" + ID.Text + ");");

Now when I click save button then it the page waits and then I have to click again to close the page automaticallly and move to the next page. Can anyone tell me why I will have to click Save button twice to activate the button.