Using Facebook login & integrate with website

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I am almost about to finish this. I have taken code from aspsnippets. Just added some of my code to check the conditions. There are two buttons One do login from facebook & fetch information which is working Then on second button click it checks whether userid(got from fb) is exist in my db or not? If not then Insert it in db. But at the end of execution I am getting this exception

System.InvalidOperationException: The connection is already open. at MySql.Data.MySqlClient.ExceptionInterceptor.Throw(Exception exception) at MySql.Data.MySqlClient.MySqlConnection.Throw(Exception ex) at MySql.Data.MySqlClient.MySqlConnection.Open() at login.Button1_Click(Object sender, EventArgs e) in C:\Users\Suraj\Desktop\fbLoginTest\login.aspx.vb:line 44

What I have tried:

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If Not String.IsNullOrEmpty(lblId.Text) Then
Dim query As String = "Select ID, email From users where ID=@id"
con.Open()
Dim cmd As New MySqlCommand(query, con)
cmd.Parameters.AddWithValue("@id", lblId.Text)
Dim dr As MySqlDataReader = cmd.ExecuteReader()
If dr.HasRows Then
'Do Login Code here
Try
Dim str As String = "select * from users where ID='" + lblId.Text + "';"
Dim cmd2 As New MySqlCommand(str, con)
con.Open()
Dim da As New MySqlDataAdapter(cmd2)

Response.Cookies("User_Type").Value = "users"
Response.Cookies("chkusername").Value = lblId.Text
Response.Redirect(Request.Url.AbsoluteUri)
Catch ex As Exception
Response.Write(ex)
con.Close()
End Try
Else
Try
Dim str1 As String = "INSERT INTO users (ID, DP, displayName) values('" + lblId.Text + "', '" + ProfileImage.ImageUrl.ToString + "', '" + lblName.Text + "')"
Dim str2 As MySqlDataReader
Dim adapter As New MySqlDataAdapter
Dim command As New MySqlCommand
command.CommandText = str1
command.Connection = con
adapter.SelectCommand = command
con.Open()
str2 = command.ExecuteReader
con.Close()
Catch ex As Exception
Response.Write(ex)
End Try
End If
End If
con.Close()
End Sub

Posted 4-Jun-16 22:46pm

SuRaj Dedhia

Updated 5-Jun-16 19:26pm

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OriginalGriff · Answer 1 · 2016-06-05T19:26:00

Look at your code:
You open the same connection three times, and only close it if there is an error for the first couple of times.
Instead of grabbing code fragments and trying to bolt them together, you need to start thinking about them, and adapting them to fit your needs.
And in this case, wherever you got the fragments from isn't that good. It is a very good idea to use a Using block with MySqlConnections, MySqlCommands, MySqlDataAdapter, and so forth to ensure that they are Closed and Disposed automatically when they go out of scope. This removes the opportunity for you to make mistakes like this.

VB

Using con As New MySqlConnection(strCon)
	con.Open()
        Using cmd As New MySqlCommand(query, con)
                ...
        End Using
        Using cmd2 As New MySqlCommand(query, con)
                ...
        End Using
        ...
End Using