Windows phone Argument Exception - windows-phone-8

Question

I Got Error as "An exception of type 'System.ArgumentException' occurred in System.Windows.ni.dll but was not handled in user code"
void Touch_FrameReported(object sender, TouchFrameEventArgs e)
{
int pointsNumber = e.GetTouchPoints(img1).Count; \\ I got the Exception in this Line
TouchPointCollection pointCollection = e.GetTouchPoints(img1);
for (int i = 0; i < pointsNumber; i++)
{
if (pointCollection[i].Action == TouchAction.Down)
{
preXArray[i] = pointCollection[i].Position.X;
preYArray[i] = pointCollection[i].Position.Y;
}
if (pointCollection[i].Action == TouchAction.Move)
{
line = new Line();
line.X1 = preXArray[i];
line.Y1 = preYArray[i];
line.X2 = pointCollection[i].Position.X;
line.Y2 = pointCollection[i].Position.Y;
line.Stroke = new SolidColorBrush(Colors.White);
line.StrokeStartLineCap = PenLineCap.Round;
line.StrokeEndLineCap = PenLineCap.Round;
line.StrokeThickness = 20;
img1.Children.Add(line);
preXArray[i] = pointCollection[i].Position.X;
preYArray[i] = pointCollection[i].Position.Y;
}
}
}
How to Handle This Exception in Windows Phone 8

Answer 1

You need a try catch with catch blocks like this...
try { ... }
catch(System.ArgumentNullException ane) { ... }
catch(System.NotSupportedException nse) { ... }
catch(System.IO.PathTooLongException ple) { ... }
catch(System.IO.SecurityException se) { ... }
catch(System.ArgumentException ae) { ... }
Make sure your 'System.ArgumentException' is your last catch. Use the 4 above if need be, you might not need path handler...