Object reference not set to an instance of an object.

Question

I created several new RichTextBox control at run time and added them to panels contol collection. This is repeated for example 20 times and I get 20 richtextbox control. for (int i = 0; i < 20;i++) { RichTextBox rtb = new RichTextBox(); rtb.Text = i.ToString(); rtb.Visible = false; rtb.Location = new System.Drawing.Point(72, 72); rtb.Name = i.ToString(); // So the Name/ID for each will be different. rtb.Size = new System.Drawing.Size(328, 128); copyPanel.Controls.Add(rtb); } Then I am trying to save the content of each of them to a text file. foreach (RichTextBox r in copyPanel) { r.SaveFile(@"c:\1.txt", RichTextBoxStreamType.PlainText); } But it doesn't seem to be working because I get the following exception: An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll Additional information: Object reference not set to an instance of an object. What is strange is that when I want to display a message with the contrls name (r.Name;) It seems to be working fine, it just doesn't want to save. Can someone help me out with this?