vb.net - Help with instructions for a login system -

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i've been working last project 3 programming course, , right think i'm doing pretty well, gotta interact access tables, save, edit, create, etc...

that has been working out pretty well, right i'm stuck login system, i've created methods encrypt password, , send password table called "security". fields in table are: username, password, email, type of account.

i can insert respective data in it. right stuck validation. need create system let me verify if username exist (i did trying insert username again , if username exists return exception), don't know how verify password in same line.

i wondering if there instruction can extract information of each field username verified? please me... idk if explain myself.. ?

ok thank u know how can retrieve variable have "select contra seguridad usuaruio = @clave"

you going want o read record table username field value of user name tested. if no record found insert record. if record found other things.

how in vb.net don't know.

the query created in code 

"select * usertable usernamefield = "' & varusername & "'"

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