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Full postback on select & remove within update panel

I'm having issues with the asp.net textbox within an update panel. It works perfectly fine when adding or removing each individual character but if I highlight all of the text within the textbox, and then remove it a full postback occurs, not a partial postback which is expected.
Why is this happening? I haven't found anything related to this particular problem so it's likely I'm doing something wrong.
Example aspx:
<asp:UpdatePanel ID="updExample" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:Repeater ID="rptExample" runat="server" .... >
<ItemTemplate>
<asp:TextBox ID="txtExample" runat="server" ClientIDMode="static" Text='<%# Eval("Example") %>' OnTextChanged="txtExample_TextChanged" AutoPostBack="true"></asp:TextBox>
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
</asp:UpdatePanel>
Example TextChanged Event:
protected void txtExample_TextChanged(object sender, EventArgs e)
{
updExample.Update();
}
Additional Notes:
Switching UpdateMode to 'Always' doesn't work.

Karthikeyan Nagaraj pointed out in the comments to try adding triggers alongside what I already had. I did in fact already have this, however, I was assigning the trigger in the ItemDataBound event which I realized was incorrect after reinvestigating. The ItemCreated event was much more suited.
I had no issues finding the control in the ItemCreated event, however adding a new async postback trigger to the update panel gave me grief and said the control couldn't be found when changing the text. To resolve this, I used the script managers RegisterAsyncPostBackControl(); method as shown below.
protected void rptExample_ItemCreated(object sender, RepeaterItemEventArgs e)
{
var input = e.item.FindControl("txtExample");
if (input != null) {
ScriptManager sm = ScriptManager.GetCurrent(this);
sm.RegisterAsyncPostBackControl(input);
}
}

ASP.NET Change label text in custom event

I am trying to change the text on a label from a custom event. When I update the text through a button click event (Button1_Click), everything works. However, when I try to update the same label in a custom event(ArReceiver_OnArDataUpdate) nothing happens. ArReceiver_OnArDataUpdate is getting triggered properly.
Why does my event react differently than a button click event? What do I need to do to get my event working?
This is an out of the box web project in VS2013. Here's the code to explain better:
Code Behind:
namespace WinReceiver
{
public partial class _Default : Page
{
protected void Page_Load(object sender, EventArgs e)
{
ArReceiver.OnArDataUpdate += ArReceiver_OnArDataUpdate;
}
void ArReceiver_OnArDataUpdate(object sender, ArEventArgs e)
{
labelVoltage.Text = "Reset";
UpdatePanel1.Update();
}
protected void Button1_Click(object sender, EventArgs e)
{
labelVoltage.Text = "Button Clicked";
UpdatePanel1.Update();
}
}
}
Default.aspx: (The site.master has the ScriptManager in it by default)
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="labelVoltage" runat="server" Text="..."></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
EDIT:
I did find this question that says it's not possible, but can someone explain why this may not be possible? I'm ok with a page refresh too, but when I tried Respone.Redirect I got exceptions.

If OnArDataUpdate is a static event, it's likely to be fired when the ASP.NET page rendering process is out of scope, and thus the label is not existent because it isn't in scope of the page being processed (since ASP.NET is stateless).
However, if ArReceiver is a control on the page, it should process fine, and the issue could be within the control or something overriding it (depending on when the event fires, it may get overridden by viewstate).

Unable to DataBind asp:Button

I read online that if I want to make a data binding expression inline I have to call the databind method on the Page_Load function. However I am unable to access the button control in the code behind for some reason. I have access to all the other buttons on my form except the one I want. Here is some code:
<asp:Button ID="CartButton" runat="server" Text="View Cart <%# Session["Counter"].ToString() %>" OnClick="List_Items" />
and
protected void Page_Load(object sender, EventArgs e)
{
CartButton.DataBind();
}
This gives me an error that 'CartButton' does not exist in the current context. Running the page without the DataBind method call returns an error telling me that my
The server tag is not well formed.
Thanks for the help!

Try This
<asp:Button ID="Button1" runat="server" Text='<%# Session["Counter"].ToString() %>'/>
May this will help you.
Regards
AB Vyas

I think in this situation you don't need the databinging. Try to do something like that instead:
protected void Page_Load(object sender, EventArgs e)
{
CartButton.Text = String.Format("View Cart {0}", Session["Counter"].ToString());
}
<asp:Button ID="CartButton" runat="server" OnClick="List_Items" />

Button Click Event does not fire

I have the following ASP-Markup:
<asp:Button runat="server" ID="btnSubmit" meta:resourcekey="btnSubmit" CssClass="submit" OnClick="btnSubmit_Click" />
And the following Code-Behind:
protected void btnSubmit_Click(object sender, EventArgs e)
{
}
For some reason, the Button Click Event does not fire ... it works on other pages with the exact same markup, I've tried doing "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i" - didn't make a difference.
Also, there is nothing AJAXy going on in this page.
Any help would be greatly appreciated.
Thanks,
Dennis

Try disabling the ValidationControls and see if the event fires.
Also try adding CauseValidation=false to the markup of your Button.

How to go to Edit Mode in FormView?

I have FormView:
<asp:FormView ID="fvReport" runat="server" DefaultMode="ReadOnly" AllowPaging="false" OnModeChanging="fvReport_ModeChanging" DataKeyNames="id">
protected void fvReport_ModeChanging(Object sender, FormViewModeEventArgs e)
{
switch (e.NewMode)
{
case FormViewMode.Edit:
fvReport.AllowPaging = false;
break;
}
}
in ItemTamplate I put LinkButton:
<asp:LinkButton ID="lbEdit" runat="server" CausesValidation="true" CommandName="Edit" CommandArgument='<%# Eval("id") %>'>Редактировать</asp:LinkButton>
Of course, FormView has EditItemTemplate section.
When I click Button, FormView is refreshed and stays in ReadOnly. What am I doing wrong?

you have to call ChangeMode method of FormView and pass the mode
fvReport.ChangeMode(DetailsViewMode.Edit);

Another option which I commonly use to go into edit mode from a formView is to add and define the EditItemTemplate element. This makes it a lot easier to make your application editable.
Within your formView you may need to change your DefaultMode to Edit. Also in your code behind try:
protected void fvReport_ModeChanging(Object sender, FormViewModeEventArgs e)
{
}
protected void lbEdit_Click(object sender, EventArgs e)
{
LinkButton lbEdit = (LinkButton)fvReport.FindControl("lbEdit");
if (sender == lbEdit)
{
fvReport.DataBind();
fvReport.ChangeMode(FormViewMode.Edit);
}
}

There could be other reasons why your FormView isn't switching over. It's usually down to badly formatted HTML. Your designer sometimes tells you of malformed sections by displaying something like this...
On those occasions when you don't get this obvious message, FormView not switching over is usually down to something a little less obvious, such as bad AssociatedControlId attributes. I would recommend looking at you labels, validators and anything where a control has to be associated to another. Something as small as this...
<asp:Label runat="server"
ID="labelAccessGrantedBy"
Text="Access Granted By"
AssociatedControlID="textAccessGranted" />
<asp:TextBox runat="server"
ID="textAccessGrantedBy"
CssClass="wmioSmall wFull"
Text='<%# Bind("access_granted_by") %>' />
Notice the deliberate use of textAccessGranted above, rather than the actual textAccessGrantedBy TextBox? That's where the command handling has failed for me in the past.