Validate user against multi login on windows forms

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I need help on how to go about making sure a user does not log in twice, the validation should be on the C#-code behind interface before registering the user twice in the database. Thanks

Posted 22-Jul-10 0:09am

seundaniel

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Sandeep Mewara 22-Jul-10 6:37am

If you have signin-signout kind of thing in your application, then this does not make much of a sense.

Stopping multiple logins when you have a login feature does not make sense. Please elaborate why you are trying so?

2 solutions

Solution 2

You could check the database to see if the user is already logged on "somewhere else", and then present them with a dialog box that says something like this:

"You're already logged on. If you login here, any other currently active session to be terminated. Continue?"

Posted 22-Jul-10 2:03am

#realJSOP

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seundaniel 23-Jul-10 0:29am

i am new to programming, kindly help out with a form of code please

#realJSOP 23-Jul-10 17:53pm

I don't have the time or desire to write code for you. Be a programmer, and figure it out.

seundaniel 26-Jul-10 1:24am

Here on the click of the button...
private void btnClock_Click(object sender, EventArgs e)
{
lblSecure.Text = txbClock.Text;
if (lblSecure.Text != txbClock.Text)
try
{
con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Client Manager\SPORT.mdb");
con.Open();
str1 = "INSERT INTO Log SELECT ID, UName, PhoneNumber FROM Client WHERE ID = '" + txbClock.Text + "'";
comd = new OleDbCommand(str1, con);
Int32 recordsAffected = comd.ExecuteNonQuery();
//String name = rdr.ToString();
txbClock.Clear();
txbClock.Focus();
if (recordsAffected.ToString() == "0")
MessageBox.Show("Not a member yet or Incorrect Clock-In Details.");
else
if (recordsAffected.CompareTo() = lblSecure.Text)
comd.Cancel();

}
catch (Exception ce)
{
MessageBox.Show(ce.Message);
MessageBox.Show(ce.StackTrace);
MessageBox.Show(ce.Source);

}

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Rajesh Sajjanar · Accepted Answer · 2010-07-22T00:48:00

Hi Seundaniel,
There are many ways you can prevent the user from multilogin, irrespective of Windows or Forms authentication on button click event of the login store the UserID
For Web --> Use Cache, Session variables
For Windows / Web you can write user to registry as soon as he logsin , and when again user try to login in the hutton click event registry value will be checked and appropriate message "Already Logged In ...!" can be displayed