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use __doPostBack got error object expected

aimds asked
Last Modified: 2012-05-09
I'm useing __doPostBack  i don't know why it does not work  
I got error"object expected" this line    __doPostBack('btnDelete','');  
 anyone can help me
i'm useing studio2005
**********function comfirm and callpostback*************
function DeleteDataTest() {           
            var answer = confirm('Do you want to delete this user?')
            if (answer) {

**********imgdelete in Repeater*******************
<img id="imgDelete" runat="server" alt="Delete" src="App_Themes/Default/images/delete2.png"
                                        style="width: 16px; height: 16px; cursor: pointer;" onclick="DeleteDataTest();"/>

*************button delete*****************************
 <asp:Button ID="btnDelete" runat="server" Text="delete" OnClick="btnDelete_Click" Visible="false" />

*************mothod btnDelete_Click *****************
protected void btnDelete_Click(object sender, EventArgs e)
        lblerrorPw.Text = "xxx";
       // DeleteUser();

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