make a Log in using SQL database entities

Question

Hi everyone .

can you help me in making a log in form for administrator using the accounts from the MySql database .. i want to know the code in connecting database, because i am new in SQl database Programming.. example there are 2 fields in SQL database the Username and Password.. the elements inside the field Username is admin and in Password is asusTek. how can i trigger the user if he enter in the wrong Username and Password in two textbox in the form .... I am Using Visual  Studio 2005 and my SQL is SQLExpress Edition with SQL server 2005

.... your help means a lot to me as a newbie in SQL database programming thanks
for any one who can give me a simple code of this .. I will accept your reply without any doubt thanks and god blezzz