how set different line of text with different font type in Richtextbox

[kenny_oh]

how to set each line with different font type in richTextbox?? i only can set the whole text within the richtextbox....how to do that?

RichTextBox1.Text &= TextBox1.Text & vbCrLf
RichTextBox1.Font = New Font(New FontFamily("Arial"), 10, FontStyle.Underline)