public bool HasWorldFile {get; set;}

//This example demonstrates how to export an individual map frame on a layout to BMP.

//Added references
using ArcGIS.Desktop.Core;                         //Project
using ArcGIS.Desktop.Layouts;                      //Layout classes
using ArcGIS.Desktop.Framework.Threading.Tasks;    //QueuedTask
using ArcGIS.Desktop.Mapping;                      //Export formats

public class ExportMapFrameToBMPExample
{
  public static Task ExportMapFrameToBMPAsync(string LayoutName, string MFName, string Path)
  {
    //Reference a layoutitem in a project by name
    LayoutProjectItem layoutItem = Project.Current.GetItems<LayoutProjectItem>().FirstOrDefault(item => item.Name.Equals(LayoutName));
    if (layoutItem == null)
      return Task.FromResult<Layout>(null);

    //Create BMP format with appropriate settings
    BMPFormat BMP = new BMPFormat();
    BMP.HasWorldFile = true;
    BMP.Resolution = 300;
    BMP.OutputFileName = Path;

    return QueuedTask.Run(() =>
    {
            //Export MapFrame
            Layout lyt = layoutItem.GetLayout(); //Loads and returns the layout associated with a LayoutItem
            MapFrame mf = lyt.FindElement(MFName) as MapFrame;
      BMP.OutputFileName = Path;
      if (BMP.ValidateOutputFilePath())
      {
        mf.Export(BMP);
      }
    });
  }
}

//This example demonstrates how to export the active mapview to BMP.

//Added references
using ArcGIS.Desktop.Framework.Threading.Tasks;    //QueuedTask
using ArcGIS.Desktop.Mapping;                      //MapView and Export formats

public class ExportActiveMapToBMPExample
{
  public static Task ExportActiveMapToBMPAsync(string Path)
  {
    return QueuedTask.Run(() =>
    {
      //Reference the active map view
      MapView map = MapView.Active;

      //Create BMP format with appropriate settings
      BMPFormat BMP = new BMPFormat();
      BMP.Resolution = 300;
      BMP.Height = 500;
      BMP.Width = 800;
      BMP.HasWorldFile = true;
      BMP.OutputFileName = Path;

      //Export active map view
      if (BMP.ValidateOutputFilePath())
      {
        map.Export(BMP);
      }
    });
  }
}

//Export the map view associated with a map frame to BMP.

//Create BMP format with appropriate settings
//EMF, EPS, GIF, JPEG, PDF, PNG, SVG, TGA, and TFF formats are also available for export
BMPFormat BMP = new BMPFormat()
{
  Resolution = 300,
  Height = 500,
  Width = 800,
  HasWorldFile = true,
  OutputFileName = filePath
};

//Reference the active layout view
LayoutView lytView = LayoutView.Active;

//Reference the map frame and its map view
MapFrame mf_bmp = layout.FindElement("Map Frame") as MapFrame;
//Export on the worker thread
  await QueuedTask.Run(() =>
  {
    MapView mv_bmp = mf_bmp.GetMapView(lytView);
    if (mv_bmp != null) { 
      //Check to see if the path is valid and export
      if (BMP.ValidateOutputFilePath())
      {
        mv_bmp.Export(BMP);  //Export to BMP
      }
    }
  });