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 Call a stored procedure
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Starting Member

19 Posts

Posted - 06/18/2013 :  15:08:42  Show Profile  Reply with Quote
Using VB and a Windows Form
I need to call a stored procedure named: validateUser

It is called by a button click and will put the info into a datatable.

Then I will use an "IF Statement" to validate that the Username and Password are valid.

If they ARE valid, then the user will be able to proceed to a Mainform
If they are NOT valid, then a Label will appear with "INVALID USERNAME/PASSWORD"

Any help will be appreciated.

Flowing Fount of Yak Knowledge

6065 Posts

Posted - 06/18/2013 :  15:37:59  Show Profile  Reply with Quote
It is hard to tell what specifically you need help with. Especially hard because you never actually asked a question.

Do you have a vb development environment like visual studio?
Do you know how to create a windows forms project?
Do you know how to create a form with a button and associate some code with the OnClick event of the button?
Do you know how to use ADO.NET objects to connect to a sql server database and call a stored procedure?
Do you have Sql server management studio and can you create a stored procedure?
Do you already have a database with tables and data necessary to perform these validations?

There are plenty of tutorials out there for all this stuff - have you tried searching for any of them?
This forum is really for advice and/or code to solve specific problems. Not so much for providing complete solutions.

Be One with the Optimizer
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James K
Flowing Fount of Yak Knowledge

3873 Posts

Posted - 06/18/2013 :  15:38:50  Show Profile  Reply with Quote
This is a standard problem that most of the frameworks including the .Net framework is set up for already. Google for "form-based authentication" and you will find lots of resources including sample code, tutorials etc. Some MSDN documentation here:
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Starting Member

19 Posts

Posted - 06/18/2013 :  15:46:32  Show Profile  Reply with Quote
Sorry TG, I should have been more specific.

I am using Visual studio 2012 and sql server 2008R2.
The form is already created with the username and password textboxs and a submit button.

The stored procedure is:
@Username nvarchar(50), @Password nvarchar(50)

FROM [User]
WHERE Username = @Username
AND [Password] = @Password

Its in Northwind database.
I already have a database connection

The tables are created and filled but only need to use the User table.

I DO NOT know how to connect to the database when the button is clicked and call the store procedure.

Once the info is passed in, I plan to write the IF statement to validate that the USERNAME/PASSWORD is valid.

This is what I need help with.

Thanks again
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Flowing Fount of Yak Knowledge

6065 Posts

Posted - 06/18/2013 :  16:07:17  Show Profile  Reply with Quote
have a look at MSDN SqlCommand. There are some examples on this as well as on most of the methods. You'll need to decide if your procedure will return a result or not because you would call a different method depending.

usually simply double clicking the button in a designer window will create the OnClick event handler where you can put this code.

Be One with the Optimizer
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Starting Member

19 Posts

Posted - 06/19/2013 :  15:01:58  Show Profile  Reply with Quote
Here is the code that I ended up using(actual sql connection X'ed out):

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'Create connection to database
Dim con As New SqlConnection("server=developmentdb1.xxxxxxxxxxx;database=Northwind;UID=NorthwindUser;PWD=NorthwindUser!;")

Dim command As SqlCommand = New SqlCommand("validateUser", con)
command.CommandType = CommandType.StoredProcedure

'add parameters
command.Parameters.AddWithValue("@Username", txtUsername.Text)
command.Parameters.AddWithValue("@Password", txtPassword.Text)

Dim result As Int32
result = CType(command.ExecuteScalar(), Int32)

If result = 1 Then


failLabel.Visible = True
End If

End Sub

I'm going to create a new thread similiar to this one about a similar code.

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