textbox.OnTextChanged doesn't fire

Form 1 updates the txtEndDate.text to "Yes" on Form2.  I want the OnTextChanged event (of Form2) to fire and call the bAdd() Sub but it doesn't.  Any ideas????  Please.

Example code for Form2.....

Sub bAdd_Click(ByVal sender As Object, ByVal e As EventArgs)
            IF txtEndDate.text="Yes" then
                    ....additional code here
           End IF
End Sub

<asp:TextBox ID="txtEndDate"  AutoPostBack="true"  OnTextChanged="bAdd"
                      runat= "server">No</asp:TextBox>
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try the onchange event.

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