Filter Extensions in HTML form upload [duplicate]
For specific formats like yours “.drp “. You can directly pass that in accept=”.drp” it will work for that. But without ” * “ <input name=”Upload Saved Replay” type=”file” accept=”.drp” /> <br/>
webforms
How to create dynamically
With JavaScript: var input = document.createElement(“input”); input.type = “text”; input.className = “css-class-name”; // set the CSS class container.appendChild(input); // put it into the DOM
How to return a JSON object in standard web forms .Net
I would suggest an HttpHandler. No page lifecycle (so it is blazing fast) and much cleaner code-separation, as well as reusability. Add a new item to your project of type “Generic Handler”. This will create a new .ashx file. The main method of any class that implements IHttpHandler is ProcessRequest. So to use the code … Read more
Limit number of characters in input field
make use of maxlength in input tag <input type=”text” maxlength=”20″ />
How to migrate existing asp.net application to asp.net MVC pattern format
These is my step-by-step guide, based on steps we have taken at my company during our move from a classic ASP.Net Webforms to ASP.Net MVC. It’s not perfect, and still ongoing since we have to do this in stages because of the size of the site, but perhaps someone else will find and file an … Read more
Check if Cookie Exists
Sometimes you still need to know if Cookie exists in Response. Then you can check if cookie key exists: HttpContext.Current.Response.Cookies.AllKeys.Contains(“myCookie”) More info can be found here. In my case I had to modify Response Cookie in Application_EndRequest method in Global.asax. If Cookie doesn’t exist I don’t touch it: string name = “myCookie”; HttpContext context = … Read more
ASP.NET MVC Performance
We haven’t performed the type of scalability and perf tests necessary to come up with any conclusions. I think ScottGu may have been discussing potential perf targets. As we move towards Beta and RTM, we will internally be doing more perf testing. However, I’m not sure what our policy is on publishing results of perf … Read more
Loop through all controls on asp.net webpage
I rather like David Finleys linq approach to FindControl http://weblogs.asp.net/dfindley/archive/2007/06/29/linq-the-uber-findcontrol.aspx public static class PageExtensions { public static IEnumerable<Control> All(this ControlCollection controls) { foreach (Control control in controls) { foreach (Control grandChild in control.Controls.All()) yield return grandChild; yield return control; } } } Usage: // get the first empty textbox TextBox firstEmpty = accountDetails.Controls .All() .OfType<TextBox>() … Read more
The ScriptManager must appear before any controls that need it
The ScriptManager is a control that needs to be added to the page you have created. Take a look at this Sample AJAX Application. <body> <form runat=”server”> <asp:ScriptManager ID=”ScriptManager1″ runat=”server”></asp:ScriptManager> … </form> </body>
How to use Dependency Injection with ASP.NET Web Forms
UPDATE 2019: With the introduction of Web Forms 4.7.2, there is now better support for DI. This invalidates the below. See: Wiring up Simple Injector in WebForms in .NET 4.7.2 You can use automatic constructor injection by replacing the default PageHandlerFactory with a custom one. This way you can use an overloaded constructor to load … Read more