public bool HasWorldFile {get; set;}

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

//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 ExportMapFrameToJPEGExample
{
  public static Task ExportMapFrameToJPEGAsync(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 JPEG format with appropriate settings
    JPEGFormat JPEG = new JPEGFormat();
    JPEG.HasWorldFile = true;
    JPEG.Resolution = 300;
    JPEG.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;
      if (JPEG.ValidateOutputFilePath())
      {
        mf.Export(JPEG);
      }
    });
  }
}

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

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

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

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

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

//Export a map frame to JPG.

//Create JPEG format with appropriate settings
//BMP, EMF, EPS, GIF, PDF, PNG, SVG, TGA, and TFF formats are also available for export
//at 2.x - JPEGFormat JPG = new JPEGFormat()
//{
//  HasWorldFile = true,
//  Resolution = 300,
//  OutputFileName = filePath,
//  JPEGColorMode = JPEGColorMode.TwentyFourBitTrueColor,
//  Height = 800,
//  Width = 1200
//};
JPEGFormat JPG = new JPEGFormat()
{
  HasWorldFile = true,
  Resolution = 300,
  OutputFileName = filePath,
  ColorMode = JPEGColorMode.TwentyFourBitTrueColor,
  Height = 800,
  Width = 1200
};

//Reference the map frame
MapFrame mf = layout.FindElement("MyMapFrame") as MapFrame;

//Export on the worker thread
await QueuedTask.Run(() =>
{
  //Check to see if the path is valid and export
  if (JPG.ValidateOutputFilePath())
  {
    mf.Export(JPG);  //Export the map frame to JPG
  }
});