If your ASP.NET application worked fine in your Development environment, but after deploying it to staging or production crashes with error:
Could not load type System.Web.UI.ScriptReferenceBase from System.Web.Extensions
most likely it was compiled against .NET 3.5 SP1 but the target machine has original .NET 3.5 framework without SP1. The solution is download Service Pack 1 and install it on target server. Another possibility – compile the project against original .NET 3.5 framework.
If you’re using Microsoft Chart control for .NET 3.5 you can specify where and how chart images are stored. And if for this purpose you’re trying to use Chart HTTP Handler setting in web config similar to this:
<add key="ChartImageHandler" value="storage=file;url=./Temp"/>
and it is failing (for example chart images are alway created in the root folder of your Web application) – there is an alternative. You can specify location of the images in properties of the chart control itself:
Just add relative path to your storage folder in front of the chart sequence string in “ImageLocation” property. and specify “UseImageLocation” for “ImageStorageMode” property
Internet Explorer has a well known proprietary modal dialog window that can be opened using showModalDialog DOM command. While it is not a good idea to use browser-specific functionality, for many it’s a convenient way to display a modal window and return result back to the parent.
Modal Dialog is designed to display data, accept user input and close window, returning the input back to the parent. It is not meant for postbacks, if you try initiating postback in Modal Dialog, all kinds of weird stuff could happen – from opening postback in a new window to JavaScript errors.
But there is an easy fix for that. If you include following line:
<base target="_self"></base>
inside of your page header in HTML source, e.g.:
<head>
<title>My Page</title>
<base target="_self"></base>
</head>
modal dialog will be able to successfully postback to itself.
Last year I described a way to display accurate row count when grid in OutlookGroupBy mode has multiple sub-groups.
That solution requires custom counting function. Fortunately to display aggregates such as SUM, AVG, MIN and MAX UltraWebGrid has a built-in functionality in form of GroupByRowDescriptionMaskDefault property of DisplayLayout. It specifies the string to be displayed in every GroupBy row and can include following substitutes:
With this in mind in just a few simple steps we can make UltraWebGrid to display something like this:
I’ve encountered a strange problem: 2 identical client machines (WinXP/IE7) were connecting to a website (running on IIS6, ASP.NET 1.1 and employing some Infragistics controls – UltraWebGrid, WebTab, WebMenu). One machine showed a perfectly rendered page, while the other displayed page with missing images and styles and JavaScript functions behaved weirdly. Also, closer examination of HTML source of the page revealed that Infragistics controls rendered very different HTML between 2 machines. Mystery.
The only difference between 2 browsers I found was UserAgent string (For quick way to check your user agent go to http://whatsmyuseragent.com/). Continue reading →
I have been using SelfSSL tool from The IIS Resource Kit to test ASP.NET HTTPS connectivity for some time now, but suddenly the connection refused to work. Checking IIS settings (ports, certificates etc.) showed that everything was A-OK. And yet pages were not displayed. And then a beautiful utility came to the rescue. Continue reading →
If you still use Visual Studio .NET 2003 (I still do for some older .NET 1.1 projects) you may experience following situation:
Fortunately there is a quick fix to that.
Continue reading →
I am using Infragistics UltraWebTab and needed to hide a tab and a tab separator located next to it using client-side JavaScript. Hiding tab is pretty trivial. Assuming we gave it a key:
<igtab:Tab Key="MyTab" Text="My tab">
The code to hide the tab is:
var uwTabControl = igtab_getTabById('xuwMyTabControl');
var tab = uwTabControl.tabFromKey('MyTab');
tab.setVisible(false);
I tried to access separator in the same way but it didn’t work. You can assign it a key, but “fromKey” method works only server-side for separators. Using client-side Tabs array of UltraWebTab didn’t work either – it contains only actual tabs, not separators. But turned out you can access the separator using a little DOM and HTML
Continue reading →
Let’s say in your ASP.NET application you set a TextBox control’s property ReadOnly to True (or Enabled to False) to prevent user from entering data directly. But you still want to update that text box’s value via client-side JavaScript. Which is happening, the value can be updated. But during postback to the server – surprise, surprise! – the new value doesn’t persist. This is due to security precaution – if the value wasn’t meant to be changed – the change is not allowed. But there is a way around this.
I was running a basic LINQ 2 SQL statement:
From role In db.user_role _
Where role.USER_ID = Session("user_id") Select role
when I encountered following error message:
Method ‘System.Object CompareObjectEqual(System.Object, System.Object, Boolean)’ has no supported translation to SQL.
After a little research I found the solution.
Continue reading →