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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);
}
}

Data Binding label control in asp.net

I have added a calender control to my Webform and on date selection change I have to display the selected date in a label control
<asp:Calendar ID="calendar1" runat="server"
onselectionchanged="calendar1_SelectionChanged" >
</asp:Calendar>
<asp:Label ID="lblInfo" runat="server" Visible="true"
Text="<%#calendar1.SelectedDate.ToShortDateString()%>">
</asp:Label>
But this is not working? Do I need to call any methods in code behind?I dont understand why this is not working.

As noted in the comment section, In your markup add an eventhandler for OnSelectionChanged for the calendar control.
<asp:Calendar ID="calendar1" runat="server"
OnSelectionChanged="calendar1_SelectionChanged" >
</asp:Calendar>
and then in your code behind, handle the event
void calendar1_SelectionChanged(Object sender, EventArgs e)
{
lblInfo.Text= calendar1.SelectedDate.ToShortDateString();
}

As the SelectionChanged event of 'calendar1' is handled by 'calendar1_SelectionChanged',
So, at the code behind, the function should be --->
private void calendar1_SelectionChanged(object sender, SelectionChangedEventArgs args)
{
lblInfo.Text= calendar1.SelectedDate.ToShortDateString();
}
The html markup renders for the first time, and it's done. But, events pertaining to those controls need to be handled in the 'code behind'

SelectedIndexChanged event of DropDownList is not fired

ASPX FILE contain DropDown as Follows:
< asp:DropDownList ID="drpDist" runat="server" CssClass="dropDownStyle" OnSelectedIndexChanged="drpDist_SelectedIndexChanged" TabIndex="6">
In ASPX.CS FILE
protected void drpDist_SelectedIndexChanged(object sender, EventArgs e)
{
}
Please Help me.I can't get why it is not working.

Use Property
AutoPostBack="True"

you need to set AutoPostBack="true"
<asp:DropDownList ID="drpDist" runat="server" AutoPostBack="true">
when you set that property as true, a postback to the server automatically occurs whenever the user changes the selection of the list

You need to set the AutoPostBack="True" property. This will make the page to postback automatically hence firing your event.

Set AutoPostBack="true"
< asp:DropDownList ID="drpDist" runat="server" AutoPostBack="true" CssClass="dropDownStyle" OnSelectedIndexChanged="drpDist_SelectedIndexChanged" TabIndex="6">

Different result when adding same attributes to asp control?

So I have this method that should run on TextChanged of a text box:
void CheckIn_TextChanged(object sender, EventArgs e)
{
checkIn.Text += "It Worked!";
}
In the aspx file I have this control:
<asp:textbox runat="server" id="checkIn" ClientIDMode="Static" AutoPostBack="true" TextChanged="CheckIn_TextChanged"></asp:textbox>
All the attributes work as they should except the TextChanged?
But if I remove this from the control and set it in the codebehind on page_load like so: checkIn.TextChanged = CheckIn_TextChanged; it does work?!
So my question is this why does it work when setting in codefile behind but not assigning the attribute to the control in the aspx file? Where am I going wrong?

Event name should be OnTextChanged. (Not TextChanged)
<asp:TextBox runat="server" ID="checkIn"
ClientIDMode="Static"
AutoPostBack="true"
OnTextChanged="CheckIn_TextChanged">
</asp:TextBox>

How do I redirect with a Drop Down List, and not a Button?

I am looking into using only a ddl to run my query, not a ddl and a Button_Click function. I am yet to find what to do. How do I do this?

In your as(p/c)x:
<asp:DropDownList runat="server"
id="ddl"
OnSelectedIndexChanged="SelectionChanged"
AutoPostBack="true">
<asp:ListItem Text="Page 1" Value="/page1.aspx" />
<asp:ListItem Text="Page 2" Value="/page2.aspx" />
</asp:DropDownList>
The "AutoPostBack" property tells ASP.NET to wire up a client-side (javascript) command that submits the form as soon as the drop down list changes, instead of waiting for a button click.
And in your codebehind, the event handler we referenced in the "OnSelectedIndexChanged" property will get fired:
protected void SelectionChanged(object sender, EventArgs e)
{
Response.Redirect(((DropDownList)sender).SelectedValue);
}

Set the AutoPostBack property to true, then hook into the OnSelectedIndexChanged event
<asp:DropDownList
id="dropDownList1"
runat="server"
AutoPostBack="true"
OnSelectedIndexChanged="dropDownList1_SelectedIndexChanged" />
Server Side
void dropDownList1_SelectedIndexChanged
(Object sender, EventArgs e) {
//run your query
}

Ensure your Drop down list has it's "AutoPostback" property set to true. This will cause the page to post back when the user selects an item from within the drop-down list. You can respond to this in your code-behind in whichever event you desire, Page_Load, or the DDL's own OnSelectedIndexChanged