VS 2008 Static text in a non readonly textbox ?

Hi !
I need to make a textbox that will look like a console input (CMD/terminal etc) and i want it to be when i write like:
"input: here_i_can_write_text"
and i write my text after input:, but i cant delete/change it.I know i could do this like placing a label just near the textbox but i really want it to be inside the textbox.Mainly i just want "input:" to stay readonly, but i will still be able to write.