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Each element in the array becomes a line of text in the text box control. If the TextBoxBase.Multiline property of the text box control is set to true and a newline character appears in the text, the text following the newline character is added to a new element in the array and displayed on a separate line.
By default, the collection of lines is a read-only copy of the lines in the System.Windows.Forms.TextBox. To get a writable collection of lines, use code similar to the following: textBox1.Lines = new string[] { "abcd" };