Set Cursor To Image From Code Behind
Changing the cursor to something unexpected is not a good idea most of the time because it may confuse your users. 
However, there may be times when it fits the situation well. 
This is how I do it using ASP.NET and C#.   The basic idea is to create a class with the cursor property set to an image and then add that class to a div from code behind. 
In this example,  I'm using FormsAuthentication and I want to change the cursor only when "chuck" is logged in. 
CSS
Create a class definition for chuck like the following.
 
.chuck{ cursor: url(../images/littleChuck.png), auto; }
A couple of things to note here: 
- Use a small image.  Don't exceed 32px in length or width
 
- Use a url path relative to the page using the image, not relative to the css file.
 
- Always follow the url() with auto.  Just two values --> cursor: url(), auto; 
 
Identify the div to Apply Cursor
You need something to apply the css class to in the code behind. 
Let's use a div for this example. 
Don't forget to use the runat="server" on the div so we can access the div from the code behind.
<div id="wrapper"   runat="server" > 
</div>
C# in Code Behind 
Add the "chuck" class to the wrapper div if the logged in user name is "chuck".
if(HttpContext.Current.User.Identity.Name.ToLower() == "chuck" ) 
{ 
       wrapper.Attributes.Add("class", "chuck"); 
} 
Summary 
Changing the cursor to image is only one of many values that can be applied.  Check out this 
link at w3schools to experiment with the 30+ values.
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