after I isntall my module in dnn, it doesn't show images.Can you help me? thanks

More information please . . .

Is this a custom module or a DNN core module? If custom . . .

Where are your images stored - the website root's /images folder or in an /images folder under your custom module's sub-folder under DesktopModules? How are you referencing the image url - via CSS or in an image tag? What url are you providing for the image source?  If you are providing the images as part of the module install, have you included them in the .zip file and referenced them in < file> nodes of the dnn manifest file or are they included as part of a resources file? When you view the page that is missing the images, what do you see for the image properties if you right click over a missing image placeholder or in the image tags of the missing images when you view the page's source?

Hopefully these questions will help you discover the problem yourself. Otherwise, please reply with the additional information.

It appears that you are using the image in an ImageButton control. When setting the ImageUrl property, you should be able to use either of these methods in the .ascx's file server control markup for ImageButton2:

ImageUrl="~/DesktopModules/gDocVisualiza/App_LocalResources/apagar.png"

or

ImageUrl='<%# ModulePath & "App_LocalResources/apagar.png" %>'

The second of these would be used if you are using databinding, such as in a datagrid.

If you are setting the ImageUrl in the codebehind/codefile, you could use:

ImageButton2.ImageUrl=Me.ModulePath & "App_LocalResources/apagar.png"

You may also want to consider creating an images folder - that is, DesktopModules/gDocVisualiza/images - and place the module's images in that folder. I prefer to use the App_LocalResources folder for .resx files only.