timestamp in sql query from vb application

I'm developing a small application which involves sql server and vb for the front end. my tables has timestamp as one of the column. when i write query directly on sql timestamp field can be skipped. But when query is written within the vb app. The query returns a error NOT ENOUGH ARGUMENTS SUPPLIED!!

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
com.ConnectionString = "server=.\sqlexpress;Database=mjjsj1;trusted_connection=True;"
If TextBox1.Text <> "" And TextBox2.Text <> "" And TextBox3.Text <> "" Then
com.Open()
cmd = New SqlCommand("insert into BACHELI values(" + TextBox2.Text + "," + TextBox5.Text + "," + TextBox8.Text + ")", com)
cmd.ExecuteNonQuery()
com.Close()
End If
End Sub

THANK YOU

Tags: Visual Basic (Visual Basic.NET 7.x (2002/03), Visual Basic 8 (2005), Visual Basic 9 (2008)), SQL, Visual Studio (Visual Studio 2008, Visual Studio 2010), SQL Server