C#

<?php

$val = $_GET["data"];

$fileContent=$val."\n";

$fileStatus=file_put_contents("datastorage.txt",$fileContent,FILE_APPEND);

if($fileStatus != false)

{

                echo  "SUCCESS. Data written in file.";

}

else

{

                echo  "FAIL. Could not connect to file.";

}

?>

private void SendBtn_Click(object sender, EventArgs e)
{
    SendData();
}

private void SendData()
{
        string text = TextBox.Text;

        string post = "data=" + text;
        byte[] data = Encoding.ASCII.GetBytes(post);

        HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://abc.com/writefile.php");
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.ContentLength = data.Length;

        Stream stream = req.GetRequestStream();
        stream.Write(data, 0, data.Length);
        stream.Close();
}

I have just practise to grab some data from a web page.
Of course, I am new in c#.
I am using regex but it does not word. and return null.

using HtmlAgilityPack;

 namespace ConsoleApp1
 {


     class Program
     {
         static void Main(string[] args)
         {
             HtmlWeb web = new HtmlWeb();
             HtmlDocument doc = web.Load("https://www.videoblocks.com/video/after-effects-cs5-template-bracket-titles-65zdx8e");

             var title = doc.DocumentNode.SelectNodes(xpath: "//ul[@class='stockItemInfo-stockSpec']").FirstOrDefault().InnerText.Split(':').FirstOrDefault();
             var secp = doc.DocumentNode.SelectNodes("//ul[@class='stockItemInfo-stockSpec']//li//span").FirstOrDefault().InnerText;


             Console.Write(title+":"+secp);
                 Console.ReadKey();
         }
     }
 }

List<PurchasingEntity> results = null;

IQueryable<PurchasingEntity> query = (from c in db.Companies
                                        join p in db.Projects on c.Id equals p.CompanyId
                                        join j in db.Jobs on p.Id equals j.ProjectId
                                        select new PurchasingEntity
                                        {
                                            CompanyId = c.Id,
                                            ProjectId = p.Id,
                                            JobId = j.Id,
                                            Phase = j.Phase,
                                            Quantity = j.Quantity.HasValue ? j.Quantity.Value : 0,
                                            StartDate = j.StartDate.HasValue ? j.StartDate : null
                                        });

var predicate = PredicateBuilder.True<Purchasing>();

if (companyId > 0)
{
    predicate = predicate.And(i => i.CompanyId == companyId);
}

if (projectId    > 0)
{
    predicate = predicate.And(i => i.ProjectId == projectId);
}

if (startDate != null)
{
    predicate = predicate.And(i => i.StartDate >= startDate);
}

if (endDate != null)
{
    predicate = predicate.And(i => i.StartDate <= endDate);
}

results = query.Where(predicate); // <===== ERROR HERE
return results.ToList();

cannot convert from 'System.Linq.Expressions.Expression<System.Func<Jayhawk.DAL.DataContext.Purchasing, bool>>' to 'System.Linq.Expressions.Expression<System.Func<Jayhawk.Entities.PurchasingEntity, int, bool>>'