can't login by sql server authentication mode

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C#

SQL

server

hello experts
I created a new user login in sql server management studio express.I set server authentication to sql server and windows authentication mode.
but when i try to login by the login name and password i get the error -
"login failed for user 'mridul.the user is not associated with a trusted
sql server connection".why is that?? (one thing is that after creating new login when i view login properties i see that in the password box the password bullets are greater than my 6 words password.is the wrong is here or where?)

mridul
www.itblog2100.blogspot.com