SqlCommand cmd = new SqlCommand("use escuela insert into dbo.alumnos values('" + Convert.ToInt32(this.txtcontrol.Text) + "', '" + this.txtnombre.Text.Trim() + "', '" + this.txtapellidop.Text.Trim() + "','" + this.txtapellidom.Text.Trim() + "','" + this.txtreferencias.Text.Trim() + "','" + Convert.ToInt32(this.txtsemestre.Text.Trim()) + "','" + this.txtfecha.Text.Trim() + "','" + this.txtgrupo.Text.Trim() + "','" + this.txtcarrera.Text.Trim() + "')", cone.conn);