newbie: how to add a variable on the value of textbox?

Question

I can't seem to add a variable on the value of my textbox... i have tried changing the designer: this.textBox1.Text = "Scriptures for " + dateNow + resources.GetString("textBox1.Text"); //dateNow is a variable set on Form.cs this works but I get an error when I try to go back to the stage... I just want to add a variable on my textbox... by the way how to you change the format of the Year to 05 instead of 2005? thanks!