Click here to Skip to main content
13,351,225 members (33,529 online)

The ConnectionString property has not been initialized

Lotus90 asked:

Open original thread
I get this error . in .. what is the wrong in my code ?

Dim dataset As New DataSet
        Dim adapter As New SqlClient.SqlDataAdapter
        Dim command As New SqlClient.SqlCommand
        Dim cmd = New SqlCommand

        Dim con As New SqlConnection


            cmd.Connection = con
            con.ConnectionString = "Data Source=lotus-pc\sqlexpress; Initial Catalog=LawyerSystem; Integrated Security= true "

            cmd.CommandText = "SELECT * FROM [users] WHERE (username='" + TextBox1.Text + "')AND (password='" + TextBox2.Text + "' )   "

            ' cmd.Connection = con
            adapter.SelectCommand = command
            '  adapter.SelectCommand.Connection = con
            adapter.Fill(dataset, "0")
            Dim count = dataset.Tables(0).Rows.Count
            If count > 0 Then
                MsgBox("uncorrect", MsgBoxStyle.Critical)
            End If

        Catch ex As Exception
            MessageBox.Show("Error while inserting record on table..." & ex.Message, "Insert Records")
        End Try
Tags: VB, VB.NET


When answering a question please:
  1. Read the question carefully.
  2. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
  3. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
  4. Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.
Let's work to help developers, not make them feel stupid.
Please note that all posts will be submitted under the The Code Project Open License (CPOL).

Advertise | Privacy |
Web03 | 2.8.180111.1 | Last Updated 26 Mar 2009
Copyright © CodeProject, 1999-2018
All Rights Reserved. Terms of Service
Layout: fixed | fluid

CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100