save aimage from the form in .jpeg format

[dhol]

Hi Using Microsoft.ink...I have to draw a image in the form and save that image in .jpeg format.....So i haveto install Microsoft Tablet pc..... so finally I installed ... and i did a program with 2 buttons in the form namely SAVE and EXIT...... so now when i run this program..i can able to draw a image of my own in the form..now when i click save button...i should be able to save the image in .jpeg format.. BUT I couldnt save.. when i click the SAVE button..and give a name for the image .... an error is shown... ERROR MESSAGE: System.NullReferenceException: Object reference not set to an instance of an object. at InkImage.Form1.button2_Click(Object sender, EventArgs e) in d:\inkimage\form1.cs:line 144.. ie, error in the last line of this program [ DrawArea.Save( sfd.FileName, format );] using System; using System.Drawing; using System.Drawing.Imaging; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using Microsoft.Ink; using System.IO; namespace InkImage { public class Form1 : System.Windows.Forms.Form { // Declare the Ink Collector object private InkCollector myInkCollector; private const float ThinInkWidth = 50; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; private Bitmap DrawArea;// make a persistent drawing area private void Form1_Load(object sender, System.EventArgs e) { // Create a new ink collector and assign it to this form's window myInkCollector = new InkCollector(this.Handle); // Set the pen width to be a width myInkCollector.DefaultDrawingAttributes.Width = ThinInkWidth; // Turn the ink collector on myInkCollector.Enabled = true; } //EXIT BUTTON private void button1_Click(object sender, System.EventArgs e) { myInkCollector.Enabled = false; this.Dispose(); } //SAVE BUTTON private void button2_Click(object sender, System.EventArgs e) { ImageFormat format = ImageFormat.Jpeg; SaveFileDialog sfd = new SaveFileDialog(); sfd.Filter = "JPEG Files(*.jpg)|*.jpg"; if (sfd.ShowDialog() == DialogResult.OK) { // now save the image in the DrawArea DrawArea.Save( sfd.FileName, format ); } } } } please help me to get the solution...... D h o l