Simon Hibbard's Web Apps Blog

Posts tagged “asp.net

MVC3 Razor – jQuery – Visual Studio != Intellisense

I wondered where my intellisense had gone for jQuery with MVC3 and Razor. Anyway there is a fix for it:

Add the following to your view (with the jQuery vsdoc version you have:

@if (false) { <script src="~/Scripts/jquery-1.5.0-vsdoc.js" type="text/javascript"></script> }

The if-statement prevents the script tag from being rendered into the html source code.

Grab jQuery 1.5.0 vsdoc from here -> http://damianedwards.com/files/jquery/jquery-1.5-vsdoc.js

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A generic error occurred in GDI+” exception

I have bumped into this quite a few times. Every time I have it has turned out to be a path problem, always check this first.

If you can, stick a breakpoint on the save call and look at the path your are saving, follow the exact path and check it precisely using windows explorer.


Cannot have multiple items selected in a DropDownList (ASP.Net)

Nasty problem. Lesson learnt.

I could not figure out why I was seeing this error, clearselection, setting index -1 etc, nothing worked when trying to set a dropdownlist selected value from code behind.

Turns out it was because I was adding a ListItem to multiple dropdownlists without instantiating a new one for each dropdownlist. This caused all the problems I was seeing.

For every Dropdownlist, create a new instance of the ListItem object before adding it – do not share it accross controls.


Unexpected calls to default.aspx page_load ?

I had a bizzare problem. From a completely unrelated aspx page I was finding myself jumping into the page_load of my default.aspx page.

Turns out this was because I had an ‘<asp:image’ tag with the image url not set (rendered as src=””).

Tricky problem to identify.


Problem with ASP.Net & Radiobuttons in repeaters/datalists/datagrids all being selectable

RadioButtons place on a page inside a repeating control (repeater/datalist/datagrid), you set the group but they are still all individually selectable.

I have come across this problem before, which was fixed using some client side script added to the radiobuttons, but this had to be done for each radiobutton group as I added them and was a bit of a pain.

I have recently found a much better solution here -> http://www.codeproject.com/KB/webforms/How_group_RButtons.aspx

Works perfectly well. Unstructions:

1) Just download the zip file at the top of the page.

2) Unzip and place the file (GroupRadioButton.dll) into your bin folder.

3) Add a reference to the assembly into your web.config or .aspx page as below:

<%@ Register TagPrefix=”vs” Namespace=”Vladsm.Web.UI.WebControls” Assembly=”GroupRadioButton” %>

Use the control on your page as you would a RadioButton

<vs:GroupRadioButton id=”MyRbn” runat=”server” GroupName=”MyRbnGrp” />

Thats it. Brilliant 🙂

Kudos to Vladimir Smirnov.