I set a value for a Multiline Textbox
like this.
textBox1.Text = \"Line1\\r\\n\\r\\nLine2\";
But, only one line space in outpu
While dragging the TextBox it self Press F4 for Properties and under the Textmode set to Multiline, The representation of multiline to a text box is it can be sizable at 6 sides. And no need to include any newline characters for getting multiline. May be you set it multiline but you dint increased the size of the Textbox at design time.