帮帮忙,请问如何获取获取TEXTBOX的内容,保存数据库表里面

protected void submit_Click(object sender, EventArgs e)
    {
      
string sql = "Insert into 表(DeviceID,UserName,PhoneNumber,FixDate,FixPlace,LMID,ModelNumber,Manufacturer) ";
            sql += "values('" + Label1.Text + "','" + UserName.Text.Trim() + "','" + PhoneNumber.Text.Trim() + "','" + FixDate.Text.Trim () + "','" + FixPlace.Text.Trim() + "','" + LMID.Text.Trim() + "','" + Manufacturer.Text.Trim() + "');";
            this.ExcuteSql(sql);
            Response.Write("<script>alert('添加成功！')</script>");
       }