change the color of a line or a word in a richtextbox?

Question

I can change the color of ONE line and/or ONE word perserving the other colors in the richtextbox?

For example i want to change the line "Processing: ..." to yellow colour, It's possible?

Thankyou for read

Answer 1

This hopefuly should do the trick for you, for example if the line contains "Processing..."

    for(int i=0; i<rtb.Lines.Length; i++) 
{ 
   string text = rtb.Lines[i];
   rtb.Select(rtb.GetFirstCharIndexFromLine(i), text.Length); 
   rtb.SelectionColor = colorForLine(text); 
} 

private Color colorForLine(string line)
{
    if(line.Contains("[Processing...]", StringComparison.InvariantCultureIgnoreCase) return Color.Green;

By the way I know you said this is for vb.net, but you shoudl be able to use a convertor to convert your code to vb.net Here is a link for one

C# to VB

I have no idea if this is correct but i think it looks a little bit like this in vb

Private Sub Test()
    For Each i As Integer In RichTextBox1.Lines.Length

        Dim Text As String = RichTextBox1.Lines(i)
        RichTextBox1.Select(RichTextBox1.GetFirstCharIndexFromLine(i), Text.Length)
        RichTextBox1.SelectionColor = ColorForLine(Text)
    Next
End Sub

Private Function ColorForLine(Line As String) As color
    If Line.Contains("Processing", ) Then
        Return ColorForLine.Green
    End If
End Function