Create block type (class) and then create a view with the same name as your block. Example: MyBlock.cs and MyBlock.cshtml (under Views and Shared).

[ContentType()]
public class MyBlock : BlockData
{        
}

Thanks for reply frederik.

here is the block i added

using System;
using System.ComponentModel.DataAnnotations;
using EPiServer.Core;
using EPiServer.DataAbstraction;
using EPiServer.DataAnnotations;

namespace Totalkredit.Models.Blocks
{
[ContentType(DisplayName = "FindBlock", GUID = "c3894d21-69fb-4cf3-b33f-75539ea5f8d4", Description = "")]
public class FindBlock : BlockData
{
[Display(
Name = "Find Block body",
Description = "",
GroupName = SystemTabNames.Content,
Order = 20)]
public virtual XhtmlString BlockBody { get; set; }
}
}

and  FindBlock.cshtml look like following

@using EPiServer.Core
@using EPiServer.Web.Mvc.Html

@model Totalkredit.Models.Blocks.FindBlock

<div>
<div>some text and html</div><div>other divs</div>
@Html.PropertyFor(m => m.BlockBody)
</div>

when i add the block to page, i can't see the two div tags or the text?

so the MyBlockcontroller is not needed in this scenario? 

Where is your view located?

FindBlock.cshtml is located at   Views/Shared