I Am Having Issue Using Bcrpt

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C#3.5

Good day all, I downloaded Bcrypt for password encryption, but i am having little with issues with saving it on my database and verifying the password..

//Code below
string mysalt = BCrypt.GenerateSalt(12);
           string myharsh = BCrypt.HashPassword(txtpassword.Text, mysalt);
//Now i want to confirm if the record exist on my database
var check = (from c in k.passwordtable select c).FirstOrDefault();
string password = check.passoword;
 if (BCrypt.CheckPassword(txtpassword.Text, check) == true)
{
lblconfirm = "Password Exist";
}
else
{
check.password = myharsh;
k.savechanges();
lblconfirm = "added";
}

//from the code above i have tried using similar password just to confirm, but its not working, 
//but if i try it without checking the database it works
like this
 if (BCrypt.CheckPassword(txtpassword.Text, myharsh) == true)
{
lblconfirm = "Password Exist";
}
else
{
lblconfirm = "Password does not Exist";
}
// how do i retrieve record from the databse and confirm it before saving it to the database to avoid duplicate.
//Thanks, I do appreciate your time and effort