Extension method '<methodname>' defined in '<modulename>' is not generic (or has no free type parameters) and so cannot have type arguments

A type argument has been specified in a call to an extension method that either has no generic parameters or has no generic parameters for which a type is not already specified. For example, the following code causes this error.

' The extension method is not generic.  
<Extension()> _  
Sub Example(ByVal str As String)  
    ' Body of the Sub.  
End Sub  

Dim str = "hi"  
'' The call to Example specifies a type argument.  
'' Not valid.  
'str.Example(Of String)()  

Error ID: BC36907

To correct this error

• Add a type parameter to the extension method definition.

• Remove the extra type argument from the procedure call.

See also

• Extension Methods
• Generic Procedures in Visual Basic