c# program will not compile

Question

I’m new to C# so please bear with me. I’ve created a Windows application and inserted code found in a book for creating a simple word processor. I’ve placed a ToolStrip RichTextBox (Dock property set to Fill) and a FontDialogBox on a form. Further I’ve created six buttons on ToolStrip and set their Text property to Copy Paste Bold Italic Normal and Font. In the ToolStrip’s Click event handler I’ve written the code: private void toolStrip1_Click(object sender EventArgs e) { //Get a valid font Font f = richTextBox1.SelectionFont; if (f == null){ f = richTextBox1.Font; } //Take action depending on the text on the Button switch (e.Button.Text) { case Copy: richTextBox1.Copy(); break; case Paste: richTextBox1.Paste(); break; case Bold: richTextBox1.SelectionFont = new Font(f.FontStyle.Bold); break; case Italic: richTextBox1.SelectionFont = new Font(f.FontStyle.Italic); break; case Normal: richTextBox1.SelectionFont = new Font(f.FontStyle.Regular); break; case Font: if (fontDialog1.ShowDialog() == DialogResult.OK) { richTextBox1.SelectionFont = fontDialog1.Font; } break; } } I get the following errors: (i) ‘System.EventArgs' does not contain a definition for 'Button' (ii) ‘System.Drawing.Font' does not contain a definition for 'FontStyle' I’d be grateful if someone could point out what the errors mean and how I can correct them.

Brandon Lewis · Answer

Just remember to attempt the cast within a try block and catch the possible InvalidCastException incase something goes amiss. Also not picking on you Scott : ) But I just thought I would point out that the Text property of the ToolStripButton is already in string format no need to convert it.

Scott Lysle · Answer

The click event's event args don't carry the button property. Since you want to read the text value of the button you could make your switch statement a little different and it will work: switch((( ToolStripButton )(sender)).Text.ToString())

Brandon Lewis · Answer

Well the definition Button doesnt exist in the EventArgs class so you cant reference it with a member access operator (the period). Are you trying to access the object that called the toolStrip1_Click event? If so you should be able to access its text property. Or you could try accessing it via the sender parameter in your method if you can. Since the object belongs to the form though it may just use the form as the sender however so that might not work but give it a shot. As for the font issue FontStyle is an enumeration. Meaning it isnt a property or normal member of the class and cant be accessed via a class object or static class reference. You can only change the FontStyle when you create a new Font. At least thats what I got from MSDN: http://msdn2.microsoft.com/en-us/library/system.drawing.fontstyle.aspx