Question

<asp:UpdatePanel ID="uppBaixa" runat="server">
    <ContentTemplate>
            <asp:TextBox ID="txt1" runat="server" AutoPostBack="true" OnTextChanged="txt1_TextChanged"></asp:TextBox>
            <asp:TextBox ID="txt2" runat="server"></asp:TextBox>
            <asp:Button ID="btnSave" runat="server" OnClick="btnSave_Click" />
    </ContentTemplate>
</asp:UpdatePanel>

This is basically what the ASPX looks like. When I leave (tab) txt1 the TextChanged event is called and it normally fills txt2. But when I change the text in txt2and hit btnSaveto update this data, the txt1_TextChanged is called AGAIN (before the actual btnSave_Click method triggers)

Answer 1

If you

• Take your sample UpdatePanel and put it into a new project (and add the ScriptManager)

• Add the following methods

  protected void btnSave_Click(object sender, EventArgs e)
  {
      this.txt1.Text = "foo";
  
  }
  protected void txt1_TextChanged(object sender, EventArgs e)
  {
      txt2.Text = txt1.Text;
  }
  

• Update txt1 to ABC then txt2 will become ABC

• Update txt2 to Bar then txt1.Text will be ABC and txt2 will Bar
• Pressing Save will just change txt1 to Foo and txt will remain Bar

This means that what you’ve described doesn’t reproduce.

Note that even when you set txt1.text = "foo" on server side it doesn’t raise the textChanged event, which means its probably something on the client side

Try adding this to your Page_Load event to find it.

  this.btnSave.Attributes.Add("OnClick", "debugger");