Develop Reference

Override asp net web form action

I have the following web form:
Working Form:
<form id="transactionParameters" method="post" runat="server" action="remote_url.aspx">
<fieldset>
<p>
<label for="Username">Username:</label>
<asp:TextBox id="Username" Text="TomSelleck" runat="server" />
</p>
<asp:Button ID="SubmitForm" runat="server" onclick="SubmitForm_Click" Text="Button" />
</fieldset>
</form>
And this successfully submits the form value Username to remote_url.aspx and brings the user to the remote page.
The problem I face is that I need to add a value to the form before submitting the form and redirecting the user e.g:
Desired functionality:
<form id="transactionParameters" method="post" runat="server">
<fieldset>
<p>
<label for="Username">Username:</label>
<asp:TextBox id="Username" Text="TomSelleck" runat="server" />
</p>
<asp:Button ID="SubmitForm" runat="server" onclick="SubmitForm_Click" Text="Button" />
</fieldset>
</form>
// This method is fired but I don't know how to execute the commented out code
protected void SubmitForm_Click(object sender, EventArgs e)
{
// Form["Username"] = Username.Text.Uppercase();
// Form["NewValue"] = DateTime.Now.ToString();
// ExecuteAction(Form, "remote_url.aspx");
}

You can accomplish this in several different ways.
Query String
Session
Cookie
Internal variable / object
The question will be what are the requirements? The easiest would be the Query String, simply do Response.Redirect("...aspx?username=Tom");.
Then on the other form you would simply parse the Query String. Request.QueryString["username"]?.ToString().
The drawback would be your url has a username in clear text and is exposed easily. The Session would store a unique identifier of that information into a cookie, making those approaches similar. But equally easy and may meet your requirements.
An internal object variable after the method fires, storing that object in memory making it accessible and exposed on the other page load event will work also.

C# function error as cannot redirect to another page

so I am still new to C# and I currently testing out my project regarding a search function when user key in what they want to find out in a the textbox and press enter and it will redirect them to my search page. However everytime i tried to type things in the search button and press enter what came out is
http://localhost:51182/Default.aspx
to
http://localhost:51182/Default.aspx?ctl00%24search=(whatever I keyed).
As the search function is in the masterpage.aspx i cannot use asp:buttons or what.
This is my code in the masterpage.
<form class="navbar-form navbar-right">
<input type="text" id="search" class="form-control" placeholder="Search..." runat="server">
<button class="btn btn-default" type="submit" id="Button1" onserverclick="Button1_OnClick"><i class="glyphicon glyphicon-search"></i></button>
</form>
This is my c# code for masterpage.
protected void Button1_OnClick(object sender, EventArgs e)
{
//The code was commented out since the search name was not able to be recognized in my webform input id so i tried to deal with the response first.
//String searchtext = search;
//String Search = Server.MapPath("Website\\HTML\\SearchEngine.aspx");
Response.Redirect("~/Website/HTML/SearchEngine.aspx?search=");
}
I mainly put the codes that I think that matters and if required the other part just say so. In addition to it if this is a duplicate to other question, I am sorry as I been trying it out on some other question answer for their fixes to this but i wasn't able to get my working then I submit this question.
Hope you guys can help me out.

<form class="navbar-form navbar-right">... </form>
In ASP.NET WebForm, you cannot use another form tag, since there is a main form tag with runat="server" already.
The easiest way to achieve is to use Panel. When user types inside textbox and press Enter key, it will call Button1_OnClick event.
For example,
<asp:Panel ID="SearchPanel" runat="server" DefaultButton="SearchLinkButton">
<asp:TextBox runat="server" ID="SearchTextBox" CssClass="form-control"
placeholder="Search..." />
<asp:LinkButton runat="server" ID="SearchLinkButton" CssClass="btn btn-primary"
OnClick="SearchLinkButton_Click">
<i class="glyphicon glyphicon-search"></i>
</asp:LinkButton>
</asp:Panel>

So you can't have nested forms, but that's not to say that you can't have multiple forms on the same page, they just can't overlap, and only one can be an ASP.NET Form[runat=server]. Just make sure the search form, which can be a vanilla HTML form, is placed in the master page outside of any Form[runat=server] and format the search form like so:
<form class="navbar-form navbar-right" action="/Website/HTML/SearchEngine.aspx">
<input type="text" name="search" class="form-control" placeholder="Search..." />
<button class="btn btn-default" type="submit"><i class="glyphicon glyphicon-search"></i></button>
</form>

calling action from button onclick

I am new on mvc programming. I have two labels, two textboxes and one button and I have to use devexpress tools. It is like login form. I want to call an actionresult from a controller class when I click the button. How can I do that if it is possible?
That's my button
<dx:ASPxButton ID="ASPxButton1" runat="server" Text="Giriş" OnClick="ASPxButton1_Click" Theme="Moderno" EnableTheming="True"></dx:ASPxButton>
and that's my button click event
<script runat="server">
protected void ASPxButton1_Click(object sender, EventArgs e)
{
}
</script>
and these are in Index.aspx page.

I'm not entirely sure what your asking, but I'll attempt to clarify.
// Model View Controller:
<form action="/Home/Validate" method="post">
<input type="text" name="username" required />
<input type="text" name="password" required />
<input type="submit" value="Submit" />
</form>
That would be in your code, then you hit the button which will submit your form and point to your Validate Controller. Which would look like:
public ActionResult Validate(string username, string password)
{
// Do Stuff, then call your next view and pass model.
return RedirectToAction("Account");
}
Important: In Model View Controller you don't call button clicks, you call Controllers. So you would point your destination to a Controller method (example):
Validate
<input type="button" onclick="/Home/Validate" />
Home - will reference the Controller
Validate - will reference the method within the Controller.
Your code is from the realm of an Web-Forms, if it is all server side code without custom JavaScript then you may be able to simply do:
<asp:UpdatePanel id="updAccount" runat="server">
<ContentTemplate>
// Your button, textbox for Submit (Alleviates Postback).
</ContentTemplate>
</asp:UpdatePanel>
That would be the simpler of the two Web-Forms approach. However, you could indeed use jQuery or JavaScript to accomplish this as well.

Post data to another site from code behind

I have a web form which is posting a few fields to a payment site. The structure the example is using is
<form method="post" action="<%= FormAction %>">
<input type="hidden" name="Hash" value="<%= sHash %>" />
<input type="hidden" name="MID" value="<%= sMID %>" />
......
<div class="submit">
<input type="submit" value="Post Data" />
</div>
Within the example project they have set the same variables within the code behind file (after declaring them) with values. When the button above is clicked it posts the data to the relevant page without errors and the user is redirected to the payment page.
So i am now trying the same under the click event of an image button on my site but doesnt work:
<asp:ImageButton ID="ButtonCheckout" runat="server" Text="Go to payment page" ImageUrl="~/Images/Payment.gif" />
and of course it doesnt work, ive added all the markup as above and added all sample code.
When i run the app it flashes and stops. I look in Fiddler and notice its not going to the payment site at all. The masterpage has declared in it - incase this makes any difference.
Reading around it seems i could use the image button to post the data and do exactly the same as the submit button (submit button is above which was part of the sample application from the payment provider) by using the onClick event in the markup with Javascript but im struggling to understand how to tie it all together and lost to what i could do next to get this working?

You can't just post form data with an image button. You need to submit the form data - otherwise your image button is just a link. I do this a lot with Javascript.
Try adding this.form.submit() to the clientclick. Or name your form and use this.formname.submit()
Either of those should post your form data.

You can such so write:
<form id="Form2" method="post" runat="server" action="<%= FormAction %>">
<input type="hidden" name="Hash" value="<%= sHash %>" />
<input type="hidden" name="MID" value="<%= sMID %>" />
......
<div class="submit">
<asp:ImageButton ID="ButtonCheckout" runat="server" Text="Go to payment page"/>
</div>
</form>
but you must add a few attributes in top of web page,eg:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" EnableEventValidation="false" EnableViewStateMac="false" ValidateRequest="false" ViewStateEncryptionMode="Never" %>

postbackurl using get rather than post

I am developing a website using asp.net c# and I want to put a form inside the page. Now as aspx pages have the form tag I do not want to nest another form inside this as it will invalidate my html. But I need this form to use GET rather than POST. I know I can change the postback url in the asp:button. Can this be done without using logic in the codbehind?
Change the method to GET just for this form not every thing on the page
change the target to _blank if possible.
Example in html of what I want.
<form action="http://maps.google.co.uk/maps" method="get">
<p><label for="saddr">Your postcode</label>
<input type="text" name="saddr" id="saddr" value="" />
<input type="submit" value="Go" />
<input type="hidden" name="daddr" value="[destination]" />
<input type="hidden" name="hl" value="en" /></p>
</form>

you can use jquery to accomplish this
$(document).ready(function() {
$("#buttonId").click(function() {
$("#formId").attr("method", "get");
});
});
the above snippet, fires when the button with id 'buttonId' is clicked. it changes the method attribute of the form with id 'formId'

You can have multiple forms in an html. ASP.NET page also supports multiple form tags, however only one of then can be server side form (runat="server").
So I will suggest that you add another form tag within your page - some thing like
...
<body>
<form runat="server">
... server controls etc
</form>
<!-- your form -->
<form action="http://maps.google.co.uk/maps" method="get">
<p><label for="saddr">Your postcode</label>
<input type="text" name="saddr" id="saddr" value="" />
<input type="submit" value="Go" />
<input type="hidden" name="daddr" value="[destination]" />
<input type="hidden" name="hl" value="en" /></p>
</form>
</body>
</html>
Note that you cannot put any server side control in your html tag. So you have to use html controls and manage them within page code using Request object.