Have to click button twice in asp.net (after autopostback textbox)

 <asp:TextBox ID="TxtDeptName" runat="server" class="formField" 

                                    Width="188px" AutoPostBack="True"></asp:TextBox>


  <asp:Button ID="Save" runat="server" CssClass="ibutton" Text="Save" 
                                    Height="30px" Width="70px" />

The problem is, when i type something in Departmetn textbox, and click on the button, you have to click twice to get the actual results up. This is because the first click is doing the "AutoPostBack" part from the text box, and then you have to click again to make the actual click postback to happen.

is there any way to solve this please help?