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BOOK: Professional ASP.NET 4.5 : in C# and VB
This is the forum to discuss the Wrox book Professional ASP.NET 4.5 in C# and VB by Jason N. Gaylord, Christian Wenz, Pranav Rastogi, Todd Miranda, Scott Hanselman; ISBN: 978-1-1183-1182-0
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Old May 3rd, 2017, 08:26 PM
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Default security help

Hello I am working on a project, and I am trying to compare the user name and password credentials to log in to my website. I do have the password hashed in the database, and have a stored procedure set up. I can get it to work if the password is in plain text, but now that it is hashed for better security, I cant get it to work that way. Here is a look at my code, and any help would be greatly appreciated.

private bool CompareStrings(string string1, string string2)
return String.Compare(string1, string2, true, System.Globalization.CultureInfo.InvariantCulture) == 0 ? true : false;

public void LogInAccount(string UserName, string UserPassword, Label InvalidLogIn)
connection.ConnectionString = @"Connection String";

string compare = @"Select UserName FROM UserInfo WHERE UserName=@UserName AND UserPassword=HASHBYTES('SHA2_512', @UserPassword)";

//string compare = "select ISNULL(UserName, '') As UserName, ISNULL(UserPassword, '') As UserPassword from UserInfo where UserName= @UserName";

SqlCommand CompareUser = new SqlCommand(compare, connection);
//SqlCommand Command2 = new SqlCommand("select * from SignUp where FirstName= @FirstName", connection);

//Command2.Parameters.AddWithValue("@FirsName", FirstName.Text);

CompareUser.Parameters.AddWithValue("@HASHBYTES('S HA2_512', @UserPassword)", UserPassword);

CompareUser.Parameters.AddWithValue("@UserName", UserName);

SqlDataReader dr = CompareUser.ExecuteReader();

//string User = UserName;
//string UserPassword = Password;

//HtmlAnchor LogIn = (HtmlAnchor)Master.FindControl("LogIn");
//HtmlAnchor SignUp = (HtmlAnchor)Master.FindControl("SignUp");

while (dr.Read())
if (this.CompareStrings(dr["UserName"].ToString(), UserName) &&
this.CompareStrings(dr["UserPassword"].ToString(), UserPassword))
InvalidLogIn.Visible = false;
FormsAuthentication.RedirectFromLoginPage(UserName , true);
InvalidLogIn.Visible = true;

Thanks a lot
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