These are the possible causes for this problem: 
	 
 
	  
		- The class name might be misspelled. 
		
-  The class is included in the referenced assemblies, but its namespace is not imported in your project. 
		
-  The class is not included in the referenced assemblies. 
		
 
		 Resolution: 
		
 
		 
		  -  Ensure you are spelling the class name correctly.