You need to be a little more specific in your question. What are you searching? What are you deleting? The answers vary wildly depending on if you are asking about a file on a disk, an element in a collection, or a character in a string.
As for a login window, if you are just wanting to create your own login window, you can create your own using a standard windows form and a couple of text boxes. Just make sure to specify a password character for teh text box that will hold the password (the property name of the text box control is "PasswordChar") .
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