Я написал код команды insert для вставки записи в таблицу с помощью SQL server 2008

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Imports System.Data.SqlClient
Imports System.Data.SqlClient.SqlCommand
Imports System.IO
Public Class MainWindow
 Dim con As New SqlConnection
    Dim cmd As New SqlCommand
<pre> Private Sub Insert_Click(sender As Object, e As RoutedEventArgs) Handles Insert.Click

        Try
            con.ConnectionString = "Data Source=MARVELL-PC;Initial Catalog=Management;User ID=abcd"
            con.Open()
            cmd.Connection = con
            cmd.CommandText = "insert into student(First Name,Middle Name,Last Nameq,Father Name,Mother Name,Occupation,DOB,Mobile No,Email-id,Address,Nationality)values('" & txtbx_student_name.Text & "','" & txtbx_student_mname.Text & "','" & txtbx_student_lname.Text & "','" & txtbx_student_ftname.Text & "','" & txtbx_student_mtname.Text & "','" & txtbx_student_occp.Text & "','" & txtbx_student_dob.Text & "','" & txtbx_student_mb.Text & "','" & txtbx_student_emid.Text & "','" & txtbx_student_addr.Text & "','" & txtbx_student_nat.Text & "')"
            cmd.ExecuteNonQuery()
            MessageBox.Show("Data Inserted Sucessfully")
        Catch ex As Exception
            MessageBox.Show("Error while inserting a record in a table..." & ex.Message, "Insert Records")
        Finally
            con.Close()
        End Try
    End Sub

What I have tried:

It gives the error message
"Error while inserting a record in a table, Login failed for the user abcd"

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