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Asp button is called by default postback method

ASPX code :
<asp:Button ID="medicalSub" runat="server" ValidationGroup="medical" Text="Save" CausesValidation="false" UseSubmitBehavior="false" ClientIDMode="Static" OnClick="medicalSub_Click" />
ASPX.CS code :
protected void medicalSub_Click(object sender, EventArgs e)
{
console.writeline("hello");
}
Error

According to that stack trace, the problem is not calling the click method. Instead, it's failing trying to load viewstate for a dropdown list control. This is long before trying to handle any events.

Try this:
copy and paste this in your page load section of your code and check if that helps:
If(!IsPostBack)
{
}
Or the following will hep:
<%# Page so just add the rest => EnableEventValidation="false" %>

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);
}
}

Change asp:Label text from C# code behind

I've been trying with this for an hour or so; just can't seem to figure out.
I have an asp:Button on an aspx page, required to complete a couple of functions, one of which is to change the text of an asp:Label. This seems like it should be simple and other online posts indicate that I'm approaching the problem correctly but...
The problem is simple but it's killing me. In an effort to debug/troubleshoot, I've stripped the code right back to very basics:
protected void Page_Load(object sender, EventArgs e)
{
allValidationMsg.Text = "Original text";
}
protected void btnRegister_Click(object sender, EventArgs e)
{
allValidationMsg.Text = "Text changed";
}
When the button is clicked, nothing happens. I'm sure it's something simple that I'm missing.
Update:
<asp:Label id="allValidationMsg" runat="server" height="22px" ForeColor="Red"></asp:Label>
<asp:Button class="navbutton" ID="btnRegister" runat="server"
Text="Register User" OnClick="btnRegister_Click" />

I think when you click on the Button, Page_Load is called again and the original text remains. Try this
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
allValidationMsg.Text = "Original text";
}
Apart from this, I assume you register the event handler for the button in the Markup as I cannot see it anywhere in your code-behind
<asp:Button id="Button1" runat="server" OnClick="btnRegister_Click" />

Possibly you have forgotten to bind button click to the handler.
You could do it something like that in code-behind:
mybutton.Click+=btnRegister_Click;
Or in aspx:
<asp:Button id="Button1"
Text="Click here for greeting..."
OnClick="btnRegister_Click"
runat="server"/>

Solved; the problem appears to have been with the use of a CompareValidator. Don't really understand why but when this validator is commented out, problem solved. Funnily enough, RequiredField and RegularExpression validators on same page cause no issues..

Hey I think I know what it is. In your markup does your label look like this??
<asp:Label ID="Label1" runat="server" >Some text</asp:Label>
You want this in your markup:
<asp:Label ID="Lable1" runat="server" text ="some text"></asp:Label>
I have had this happen before. If you change the markup to that. It should work.

I can see that you wrote "onclick" instead of "OnClick" in the markup (case). Possibly it is the cause of the issue.
UPDATE1
Could you try to do so (check if postback works):
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
allValidationMsg.Text = "Original text";
}
else
{
allValidationMsg.Text = "After postback";
}
}
If the text is changing after pressing the button?
UPDATE2 Also, please try to make some changes in the text to understand if a new version really deploys (to exclude strong caching issues).
UPDATE3 You can try to do binding in codebehind (and delete it from aspx).

Redirecting new tab on button click.(Response.Redirect) in asp.net C#

I'm trying to open a page in new tab/window on button click.I tried in the google got this code but its not working.
Can anybody help me with this?
<asp:Button ID="btn" runat="Server" Text="SUBMIT"
OnClick="btnNewEntry_Click" OnClientClick="aspnetForm.target ='_blank';"/>
protected void btnNewEntry_Click(object sender, EventArgs e)
{
Response.Redirect("CMS_1.aspx");
}
When I use this I'm getting error saying
Microsoft JScript runtime error: 'aspnetForm' is undefined.

You can do something like this :
<asp:Button ID="Button1" runat="server" Text="Button"
onclick="Button1_Click" OnClientClick="document.forms[0].target = '_blank';" />

Wouldn't you be better off with
<asp:HyperLink ID="HyperLink1" runat="server"
NavigateUrl="CMS_1.aspx"
Target="_blank">
Click here
</asp:HyperLink>
Because, to replicate your desired behavior on an asp:Button, you have to call window.open on the OnClientClick event of the button which looks a lot less cleaner than the above solution. Plus asp:HyperLink is there to handle scenarios like this.
If you want to replicate this using an asp:Button, do this.
<asp:Button ID="btn" runat="Server"
Text="SUBMIT"
OnClientClick="javascript:return openRequestedPopup();"/>
JavaScript function.
var windowObjectReference;
function openRequestedPopup() {
windowObjectReference = window.open("CMS_1.aspx",
"DescriptiveWindowName",
"menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes");
}

I think your code should work just remove one thing from here but it'll do redirection from current page within existing window
<asp:Button ID="btn" runat="Server" Text="SUBMIT"
OnClick="btnNewEntry_Click"/>
protected void btnNewEntry_Click(object sender, EventArgs e)
{
Response.Redirect("CMS_1.aspx");
}
And if u wanna do the this via client side scripting
Use this way
<asp:Button ID="BTN" runat="server" Text="Submit" OnClientClick="window.open('Default2.aspx')" />
According to me you should prefer the Client Side Scripting because just to open a new window server side will take a post back and that will be useless..

This is what I ended up using. Temporarily sets target to _blank, then sets it back.
OnClientClick="var originalTarget = document.forms[0].target; document.forms[0].target = '_blank'; setTimeout(function () { document.forms[0].target = originalTarget; }, 3000);"

You have to add following in header:
<script type="text/javascript">
function fixform() {
if (opener.document.getElementById("aspnetForm").target != "_blank") return;
opener.document.getElementById("aspnetForm").target = "";
opener.document.getElementById("aspnetForm").action = opener.location.href;
}
</script>
Then call fixform() in load your page.

You can use Rout redirecting.
protected void btnNewEntry_Click(object sender, EventArgs e)
{
Response.RedirectToRoute("CMS_1");
}
which requires to define your routing logic in Global.asax file that could be like that:
routes.MapPageRoute("CMS_1", "CMS_1", "~/CMS_1.aspx");
where any request by CMS_1 pattern in application scope will be redirecting to CMS_1.aspx, but in URL shows like www.yoursite.com/CMS_1

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.