C# - event not firing

I have two events:

1. btn1_Click (firing okay, but...)
2. cboRegion_OnTextChanged (is not firing.)

The html/aspx lines for each event shown just above the events.

Question: How can I change the event for cboRegion so it would fire as well?

Thank you.
<asp:Button ID="btn1"  GroupName="cmdOpt" Name="opt" runat="server" Text="1" TabIndex="1" onclick="btn1_Click"   />

protected void btn1_Click(object sender, EventArgs e)
    {
        Session["strBtn"] = strBtn;
        // Response.Redirect("Default2.aspx",false);
    }
------------------------------------
       <asp:DropDownList ID="cboRegion" runat="server" Width="83" OnTextChanged="cboRegion_OnTextChanged" >
            <asp:ListItem Text="Region 1" Value="1"  />
            <asp:ListItem Text="Region 2" Value="2"  />
            <asp:ListItem Text="Region 3" Value="3"  />
        </asp:DropDownList>

    protected void cboRegion_OnTextChanged(object sender, EventArgs e)
    {
        Session["Year"] = "3333";
        // Response.Redirect("Default2.aspx",false);
    }

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LVL 34
Mike EghtebasDatabase and Application DeveloperAsked:
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Raghu MutalikdesaiSenior Manager in a leading IT Services companyCommented:
Instead of OnTextChanged event, try using OnSelectedIndexChanged event.
OnSelectedIndexChanged="cboRegion_Change"

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I am assuming user is not allowed to "type" in the drop down, and only "select"
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Mike EghtebasDatabase and Application DeveloperAuthor Commented:
Hi Raghu for coming to my rescue,

That was excellent point because the users just select not change values. This is what is happening now:

I select a different year but its event doesn't fire. However, when I click on the button, all of sudden it stops at the break point in cboRegion_Change event.

Question: What is the explanation for this?

Thanks,

Mike
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Mike EghtebasDatabase and Application DeveloperAuthor Commented:
Possibly, one difference between the button and the rest is buttons submit while the other may not do that. Does this kind of make sense to you?

If so, then how can we get some action from the controls other than buttons?
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Mike EghtebasDatabase and Application DeveloperAuthor Commented:
I got it, I need to set:

AutoPostBack="True"

in those controls.
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Raghu MutalikdesaiSenior Manager in a leading IT Services companyCommented:
Well, you were too quick and you figured out the answer even before I looked at your comment! Thanks for accepting my answer.
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Mike EghtebasDatabase and Application DeveloperAuthor Commented:
I appreciate for the participation.

Mike
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Mike EghtebasDatabase and Application DeveloperAuthor Commented:
Hi Raghu,

I have couple of other questions now. Do you have some time to take a look at them? I will be glad to post the links for the questions here.

Mike
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Raghu MutalikdesaiSenior Manager in a leading IT Services companyCommented:
Sure. please post the questions. I will try to answer those.
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