Check out example codes for "absatz messagebox c#". It will help you in understanding the concepts better.

Code Example 1

MessageBox.Show("erste Zeile" + Environment.NewLine
+"zweite Zeile" + Environment.NewLine
+ "dritte Zeile");

Code Example 2

MessageBox.Show("erste Zeile\r\nzweite Zeile!");
// \r = Carriage Return (Wagenrücklauf)
// \n new Line (neue Zeile)

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