connection in vb.net for sql server

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SQL-Server

i want to add data in a sql server table from vb.net applicattion pls help me,

my code block is-:

Imports System.Data.SqlClient
Imports System.Data.SqlClient.SqlConnection

Public Class Form1
    Private cn As SqlConnection
    Dim constr As String

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        constr = "Integrated Security=SSPI;Initial Catalog=anand;Data Source=ANAND-PC\SQLEXPRESS;"

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim cmd As New SqlClient.SqlCommand
        Dim query As String
        query = "Insert Into anand1 (roll) values (" & TextBox1.Text & ");"

        cmd.CommandText = query
        cmd.CommandType = CommandType.Text
        cmd.Connection = cn

        cn.Open()

        cmd.ExecuteNonQuery()

        cn.Close()

    End Sub