Developing SharePoint 2013 visual webpart with Visual Studio

Download SharePoint 2013 Developer Tools at here

Open visual studio 2012 >> Visual C# >> Sharepoint Solution >> Name: HelloVisualWebpart2013

Deploy as a farm solution

Here is UI of visual webpart >> add literal control

Programming as follows:

Deploy

Open sharepoint site

Edit page

Insert >> Webpart

At categories >> custom >> choose webpart available

Result as