StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POHow do I Validate a User Using LINQ to SQL?
primarykey
Id
548462
data
AcceptedAnswerId
548476
AnswerCount
2
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2009-02-14T04:08:38.053
FavoriteCount
0
LastActivityDate
2009-02-15T14:00:16.397
LastEditDate
2009-02-15T14:00:16.397
LastEditorUserId
3394
OwnerUserId
65403
ParentId
0
PostTypeId
1
Score
-1
ViewCount
6927
LastEditorDisplayName
kronoz
text
Body
I'm trying to work out how to validate a user in my application but i don't know how. I wish create a form with Username and Password to enter in the application(WPF) using Linq toSql to store and validate Username and password in the database but i don't know so much about Linq to Sql so i keep in stuck now. I have a database with this fields"UserID,UserTypeID,Name,Surname,Username,Password,Email" and here there is the code that i use : <pre><code>public Window1() { InitializeComponent(); } public bool ValidateApplicationUser(string userName, string password) { bool validUser = false; try { // var conn = "Data Source=MAMMA-PC/SQLMAMMA;Initial Catalog=MyWebSite;Integrated Security=True"; DataClasses1DataContext dc = new DataClasses1DataContext(); Table<User> users = dc.GetTable<User>(); var query = from c in dc.Users where (c.Username == userName.ToLower() && c.Password == password.ToLower()) select c; validUser = (query != null); } catch (Exception ex) { if (ex != null) { } } return validUser; } private void mahhh(object sender, RoutedEventArgs e) { bool authenticated = true; // var conn = "Data Source=MAMMA-PC/SQLMAMMA;Initial Catalog=MyWebSite;Integrated Security=True"; DataClasses1DataContext dc = new DataClasses1DataContext(); Table<User> users = dc.GetTable<User>(); var query = from c in dc.Users where (c.Username == usernameTextBox.Text.ToString() && c.Password == passwordTextBox.Text.ToString()) select c; /* foreach (User user in query) { user.Username = usernameTextBox.Text.Trim(); user.Password = passwordTextBox.Text.Trim(); } */ { if (usernameTextBox.Text !="" && passwordTextBox.Text != "") { authenticated = ValidateApplicationUser(usernameTextBox.Text , passwordTextBox.Text); } } if (!authenticated) { MessageBox.Show("Invalid login. Try again."); } else { MessageBox.Show("Congradulations! You're a valid user!"); // Window2 c = new Window2(); // c.ShowDialog(); this.Close(); } } </code></pre> When i insert the password and username the form validate also wrong username and password so i receive always the message "Congradulations! You're a valid user!"!!! DO you have any advice where i wrong? Bye
Tags
<c#><.net><linq-to-sql>
Title
How do I Validate a User Using LINQ to SQL?
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USljs
UserOwnerUserId
1. USJayJay
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POHow do I Validate a User Using LINQ to SQL?
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTDownMod
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.