Get MxDocument from ArcMap Snippet

///<summary>Get MxDocument from ArcMap.</summary>
///<param name="application">An IApplication interface that is the ArcMap application.</param>
///<returns>An IMxDocument interface.</returns>
///<remarks></remarks>
public ESRI.ArcGIS.ArcMapUI.IMxDocument GetMxDocumentFromArcMap(ESRI.ArcGIS.Framework.IApplication application)
{

  if (application == null)
  {
    return null;
  }

  ESRI.ArcGIS.Framework.IDocument document = application.Document;
  ESRI.ArcGIS.ArcMapUI.IMxDocument mxDocument = (ESRI.ArcGIS.ArcMapUI.IMxDocument)(document); // Explicit Cast

  return mxDocument;

}

'''<summary>Get MxDocument from ArcMap.</summary>
'''<param name="application">An IApplication interface that is the ArcMap application.</param>
'''<returns>An IMxDocument interface.</returns>
'''<remarks></remarks>
Public Function GetMxDocumentFromArcMap(ByVal application As ESRI.ArcGIS.Framework.IApplication) As ESRI.ArcGIS.ArcMapUI.IMxDocument

  If application Is Nothing Then
    Return Nothing
  End If

  Dim document As ESRI.ArcGIS.Framework.IDocument = application.Document
  Dim mxDocument As ESRI.ArcGIS.ArcMapUI.IMxDocument = CType(document, ESRI.ArcGIS.ArcMapUI.IMxDocument) ' Explicit Cast

  Return mxDocument

End Function