Windows Form Error: The name HttpUtility does not exist in the current context

Hismile,

You have add the reference but not imported the namespace.

You need to import the namespace.

C#

using System.Web;

VB.Net

Imports System.Web

If this will not work 

Right click the Reference in the Solution Explorer.

Choose Add Reference.

Select the .NET tab.

Search and add System.Net.

Then import the below namespace.

C#

using System.Net;

VB.Net

Imports System.Net

Then use the below code.

C#

WebUtility.HtmlEncode(body);

VB.Net

WebUtility.HtmlEncode(body)