cannot replace a character in a string

[cirollo]

Hi! I cannot figure out why this doesn't work:

If TxtImpUni.Text.Contains(",") Then
          TxtImpUni.Text.Replace (",",".")
End If

if my string is 123,45 I expect 123.45 but remains 123,45

Why??????

 

[klaus]

This code does work:

TxtImpUni.Text = TxtImpUni.Text.Replace(",", ".")

Best regards.