The ConnectionString property has not been initialized.

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VB

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnsave.Click
        Dim con As New SqlConnection
        Dim cmd As New SqlCommand
        Try
            'con.ConnectionString = "Data Source=E550;Initial Catalog=DeviceDB;Integrated Security=True"

            con.Open()
            cmd.Connection = con
            cmd.CommandText = "INSERT INTO TBL_APPLICATION_COD VALUES('" & txtapcode.Text & "','" & txtapdes.Text & "')"
            cmd.ExecuteNonQuery()

        Catch ex As Exception
            'MsgBox.Show("Error while inserting record on table..." & ex.Message, "Insert Records")
            MsgBox("Error " & ex.Message)
        Finally
            con.Close()
        End Try
    End Sub

Posted 1-Jun-13 20:49pm

akhil.krish

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Zoltán Zörgő 2-Jun-13 2:51am

Of course not. And your question is....?

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2013-06-01T20:59:00

The error is due to the line, which you have commented out...

VB

'con.ConnectionString = "Data Source=E550;Initial Catalog=DeviceDB;Integrated Security=True"

You should initialize the ConnectionString property of SqlConnection Class[^] before using its instance (in your code that is con).

So, don't comment this line and try. Make sure the ConnectionString is correct.

Else follow - http://connectionstrings.com/[^] to find the correct and appropriate ConnectionString for your application.