Read from dictionary

[josh wood]

I have a program that looks up words in a dictionary. The dictionary is in the form of a text file with one word per line. I have tried

If TextBox.Text.Contains(Dictionary.ReadLine()) Then 
MsgBox("This contains a word", MsgBoxStyle.Information, "Info")
end if

however it only looks at the first line of the dictionary, not every line. Any ideas on how to make it read each line individually. By the way, the text has no spaces and no punctuation.

(Dictionary is a streamreader)