Develop Reference

How to change text box text by click on button

Hello I am beginner in asp.net webforms and i want to copy text of textbox in another textbox when i click in button
my code is :
protected void Button2_Click(object sender, EventArgs e)
{
TextBox15.Text = TextBox6.Text;
}
when i fill TextBox6 and click button nothing show in TextBox15

Try to use IsPostBack property in the pade_load event handler to prevent re-validation of the page every time you click the button.
if (!IsPostBack)
{
//do nothing
}
By the way code of your button click will remain as it is, dont change anything of it, just write the above code on the page load.
I hope it helps

C# dynamically created user control button click not working

I have a page (company.aspx) that when you click a button on the page the button click event (btnShowDeptsUserControl_Click) dynamically creates a user control and adds to a placeholder. The page reloads with the user control displayed. That works fine.
The issue I am having is that when I click the button on the user control itself, the btnEmailDepts_Click event is not fired, but the main page (company.aspx) is reloaded.
I have read that one way to resolve this is to create the dynamic user control in Page_Init, but I am creating the user control from the main page button click. Also, I am not declaring the user control in the code behind of the main page as you would normally, but do have a placehoder within which the user control is added.
I have also read that you can add a delegate to the main page for the user control button click, but the example seemed to have so much necessary code for such a simple thing that I figured there must be a better way.
Here are the relevant code snippets:
company.aspx:
<asp:Button id="btnShowDeptsUserControl" runat="server" OnClick="btnShowDeptsUserControl_Click">Show Depts</asp:Button>
<asp:PlaceHolder ID="phUserControls" runat="server"></asp:PlaceHolder>
company.aspx.cs:
protected void btnShowDeptsUserControl_Click(object sender, EventArgs e)
{
CreateDeptsUserControl();
}
private void CreateDeptsUserControl()
{
phUserControls.Controls.Clear();
var uc = (UserControl)LoadControl("~/controls/ucDepartments.ascx");
phUserControls.Controls.Add(uc);
}
ucDepartments.ascx:
<asp:Button ID="btnEmailDepts" runat="server" Text="Send Email" OnClick="btnEmailDepts_Click" />
ucDepartments.ascx.cs:
protected void btnEmailDepts_Click(object sender, EventArgs e)
{
EmailDepts(); // breakpoint here is never hit
}
private void EmailDepts()
{
// do something
}

If you read the MSDN, you will notice:
However, the added control does not catch up with postback data processing. For an added control to participate in postback data processing, including validation, the control must be added in the Init event rather than in the Load event.
You are adding your control in the click event which happens after both init and load events, so the postback will not work.
You can call your CreateDeptsUserControl function in the ini event, but there you will have to detect if the btnShowDeptsUserControl was clicked by yourself. It's not hard, you will need to check the submitted values collection and see if there is an item for btnShowDeptsUserControl.

Just wanted to post what I did to make this work. Racil Hilan's answer helped me to arrive at this solution. I did away with the dynamic user control, and went with the more common declared user control in the aspx, but set it to Visible="False" by default.
Notice that the main page button event is empty. Also notice that the user control Page_Load event is empty. All the checking is done in the user control OnInit event, which is executed with each main page load.
In the user control OnInit event I have a couple guard conditions that check to see what EVENTTARGET, if any, caused the page / user control to load. If the EVENTTARGET (control ID) is that of the main page button, then execution will continue and will call LoadSomeData() as well as set the user control Visible = true. Otherwise, if either guard condition evaluates as false, we exit and the user control does not get loaded, so no wasted db / service calls.
company.aspx:
<asp:Button id="btnShowDeptsUserControl" runat="server" OnClick="btnShowDeptsUserControl_Click">Show Depts</asp:Button>
<uc1:ucDepartments ID="ucDepartments" runat="server" Visible="False" />
company.aspx.cs:
protected void btnShowDeptsUserControl_Click(object sender, EventArgs e)
{
// empty, just need the event for inspection later in user control OnInit event.
}
ucDepartments.ascx:
<asp:Button ID="btnEmailDepts" runat="server" Text="Send Email" OnClick="btnEmailDepts_Click" />
ucDepartments.ascx.cs:
protected override void OnInit(EventArgs e)
{
if (string.IsNullOrWhiteSpace(Request.Params["__EVENTTARGET"]))
return;
var controlName = Request.Params["__EVENTTARGET"];
if (controlName != "btnShowDeptsUserControl")
return;
LoadSomeData(); // call method to load the user control
this.Visible = true;
}
protected void Page_Load(object sender, EventArgs e)
{
// empty
}
private void LoadSomeData()
{
// get data from database
// load table / gridview / etc
// make service call
}
protected void btnEmailDepts_Click(object sender, EventArgs e)
{
EmailDepts(); // this event is now executed when the button is clicked
}
private void EmailDepts()
{
// do something
}
Variation that includes jquery to scroll to user control after postback:
In the main page button click event you can also do something like set a hidden var to a value that can be inspected on main page doc ready to do some jquery stuff, such as scrolling the user control into view if it is far down the page (which I am actually doing in my current task).
Not only will this scroll the now loaded user control into view after clicking the main page button, but notice the code in setupDepts(). I hide the asp button that does a postback to load the user control, and show a regular html button. They both look the same (both say Show Depts), but the regular html button, when clicked, will fire jquery to toggle the div that contains the user control to close, click again, it will open, click again it will close, etc.
This is so that you only load the user control once (make db / service calls once) when the main page button is clicked, and then can toggle show or hide it with subsequent clicks of the alternate button. This approach can be used with multiple buttons or links so long as they all have the same class ids. For example, you may have a Show Depts button / link at top of page and another at the bottom of the page, which is the case in my current task.
company.aspx:
<asp:Button id="btnShowDeptsUserControl" runat="server" class="btnShowDepts" OnClick="btnShowDeptsUserControl_Click">Show Depts</asp:Button>
<button class="btnToggleDepts" style="display: none;">Show Depts</button>
<div id="divShowDepts" style="display: none;">
<asp:HiddenField runat="server" id="hdnShowDepts"/>
<uc1:ucDepartments ID="ucDepartments" runat="server" Visible="False" />
</div>
<script language="javascript" type="text/javascript">
$(function () {
toggleDeptsUserControl();
if ($('#<%=hdnShowDepts.ClientID%>').val() === "show")
setupDepts();
});
function setupDepts() {
$('.btnShowDeptsUserControl').hide();
$('.btnToggleDeptsUserControl').show();
scrollToDepts();
}
function scrollToDepts() {
$('#divShowDepts').toggle(700, function () {
if ($(this).is(":visible")) {
$('html, body').animate({ scrollTop: ($(this).offset().top) }, 'slow');
}
});
}
function toggleDeptsUserControl() {
$('.btnToggleDeptsUserControl').on('click', function (event) {
event.preventDefault();
scrollToDepts();
});
}
</script>
company.aspx.cs:
protected void btnShowDeptsUserControl_Click(object sender, EventArgs e)
{
hdnShowDepts.Value = "show";
}

How to show modal popup on page index changed event?

I have one user control having gridview in it.In my aspx page i have modal popup to show this user control.So,when i click on page index modal popup get disappears.
So,how can i avoid disappearance of modal popup on page index change in asp.net.
Thanks.

C# code:
public bool showModelPopup = false;
void GridView1_PageIndexChanging(Object sender, GridViewPageEventArgs e)
{
showModelPopup = true;
//Your code
}
.apsx: (jQuery)
$(function(){
if ("<%=showModelPopup%>" == "true")
$("#ModelPopUpID").show();
});

Every postback will cause the Popup to disappear. If just certain postsback can handle during your popup you could put a MyModalPopupExtender.Show() into the code that handles that postbacks.

Creating an event for a textbox and AJAX Update Panel Control

I wanted to create a "Click" event for a textbox in C# (as there isn't any).
So, this way
protected void Page_Load(object sender, EventArgs e)
{
if (Request["__EVENTARGUMENT"] != null && Request["__EVENTARGUMENT"] == "txt1OnClick")
{
txt1_Click();
}
txt1.Attributes.Add("onclick", this.Page.ClientScript.GetPostBackEventReference(txt1, "txt1OnClick"));
}
private void txt1_Click()
{
ImageMap1.ImageUrl = "guide/1.jpg";
}
Then I wanted to load the image without reloading the page.
So I used the AJAX UpdatePanel Control and this worked fine with
protected void Button1_Click(object sender, EventArgs e)
{
ImageMap1.ImageUrl = "guide/1.jpg";
}
But not with the event I created, because the compiler doesn't identify my new events as
a real event or something I couldn't figure out.
I added the button1_click event according to Step 8 of "Refreshing an UpdatePanel Control with an External Button".
The click event of textbox is not shown in this option:
So my question is is there any way to add this event within System.Web.UI.WebControls.TextBox class or, to make this event visible within the above option?
So that I can include click event of the textbox within the Triggers of the update panel.

If you try to create a Click event for a TextBox, every time a user clicks your textbox you'll trigger a postback to the server (even to evaluate if you need to do something as part of handling the event). This is very inefficient - you should handle clicks in the browser, using JavaScript and then trigger the UpdatePanel using client-side logic.
This lets you trigger a call to the server if you need it but avoid it when you don't. If you have a server-side event handler, your code will post back to the server (reloading the page) every time the user clicks the TextBox.
You can read this link (and others) about using __doPostBack() on the client side to trigger an UpdatePanel to perform a postback.
http://encosia.com/easily-refresh-an-updatepanel-using-javascript/

Show and Hide Modal Popup Extender Not working

Hi all I have a modal popup extender set to a hidden linkbutton. So when I want to use it I am doing
protected void ProcessFileBtn_OnClick(object sender, EventArgs e)
{
WaitModalPopupExtender.Show();
//DO STUFF
WaitModalPopupExtender.Hide();
}
Process takes a while, but no Modal Pop Up extender shows, when I create a button just to do the show function it works, but when I add in this
protected void Test_Click(object sender, EventArgs e)
{
WaitModalPopupExtender.Show();
System.Threading.Thread.Sleep(5000);
WaitModalPopupExtender.Hide();
}
Nothing shows up. Any thoughts?

It won't work.
Why...??
First request sent to Server.
WaitModalPopupExtender.Show();----Executed---But no response send to Client
System.Threading.Thread.Sleep(5000);----Executed---But no response send to Client
WaitModalPopupExtender.Hide();----Executed---Now its time to send the response
Now you can expect the output that will be sent to the Client

Without seeing all of the code it's hard to tell, but I believe that the page is doing a PostBack when you click the linkbutton. When the page does a postback, it refreshes and therefore your ModalPopupExtender won't show. I think you're looking for and Ajax call to do what you want, which I'm pretty sure is showing a wait window while processing data.