send email vb

i am sending an email within my asp.net website (vb)
and i can currently send text that i write into a text box. using this code:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim sb As New StringBuilder
        sb.Append("email adress: ")
        sb.Append(txtemail.text)
        sb.AppendLine()
        sb.Append("comment: ")
        sb.Append(txtcomment.text)
        sb.AppendLine()
        sb.Append("things already in stock that have been alocated to this job:")
        sb.AppendLine()
     &n ...