public ExportWebMap()
{
InitializeComponent();
printTask = new PrintTask("http://sampleserver6.arcgisonline.com/arcgis/rest/services/Utilities/PrintingTools/GPServer/Export%20Web%20Map%20Task");
printTask.DisableClientCaching = true;
printTask.ExecuteCompleted += printTask_PrintCompleted;
printTask.GetServiceInfoCompleted += printTask_GetServiceInfoCompleted;
printTask.GetServiceInfoAsync();
}