Question

Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
    Dim SQLData As New System.Data.SqlClient.SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ASPNETDB.MDF;Integrated Security=True;User Instance=True")
    Dim cmdSelect As New System.Data.SqlClient.SqlCommand("SELECT * FROM a1_bustype where bustype=" & DropDownList1.SelectedItem.Text.ToString, SQLData)
    SQLData.Open()
    Dim dtrReader As System.Data.SqlClient.SqlDataReader = cmdSelect.ExecuteReader()
    If dtrReader.HasRows Then
        While dtrReader.Read()
            TextBox1.Text = dtrReader("buscode")
        End While
    End If

    dtrReader.Close()
    SQLData.Close()
End Sub

I have following entry in database tabel …in bustype column i have ..A/c seater volvo and bus code is S41

when i run the webpage it shows the following error invalid column name ‘A’

Answer 1

If bustype is text or varchar you have to add single quotes to your query

UPD: I don’t realy sure how it’l be in vb, something like this:

"SELECT * FROM a1_bustype where bustype='" & DropDownList1.SelectedItem.Text.ToString & "'"