C#

Quote:

using System.Web; // requires a reference to System.Web.dll
using System.Web.Configuration; // requires a reference to System.Configuration.dll

///

/// Imports an xml store by it's relative path in ASP.NET and returns the requested connection.
/// Does not open the connection.
///

/// <param name="httpContext" />Context of HTTP request to resolve relative path with. (e.g. HttpContext.Current)
/// <param name="configurationFileName" />Full or relative server path. (e.g. ~/App_Data/databases.xml)
/// <param name="connectionName" />Returns a new instance of the provider's class that represents a connection to the database.
public static DbConnection Open(HttpContextBase httpContext, string configurationFileName, string connectionName)
{
DbConnection connection = Connection(httpContext, configurationFileName, connectionName);
connection.Open();
return connection;
}

///

/// Imports an xml store by it's relative path in ASP.NET and returns the requested connection.
/// Does not open the connection.
///

/// <param name="httpContext" />Context of HTTP request to resolve relative path with. (e.g. HttpContext.Current)
/// <param name="configurationFileName" />Full or relative server path. (e.g. ~/App_Data/databases.xml)
/// <param name="connectionName" />Returns a new instance of the provider's class that represents a connection to the database.
/// <returns>Returns a new instance of the provider's class that represents a connection to the database.
public static DbConnection Connection(HttpContextBase httpContext, string configurationFileName, string connectionName)
{
Sources.ImportXmlStore(httpContext.Server.MapPath(configurationFileName));
return Connection(connectionName);
}

Quote:

DbConnection connection = Connection(httpContext, configurationFileName, connectionName);

Quote:

public static DbConnection Connection(HttpContextBase httpContext, string configurationFileName, string connectionName)

The while loop stop when data reads x, but the buttonTransfer button never gets enabled
and the MessageBox message never shows up, but the program does not either freeze. What can be the problem with this code?

try
{
  buttonTransfer.Enabled = false;
  port = new SerialPort();
  port.BaudRate = 9600;
  port.PortName = getValueNew;
  port.Open();

  port.Write("1");

  while (data != "x")
  {
     data = port.ReadLine();
     this.Invoke(new EventHandler(displaydata_event));
  }
  buttonTransfer.Enabled = true;
  MessageBox.Show("Done!");
  port.Close();
}
catch (Exception ex)
{
   MessageBox.Show(ex.Message);
}

public class IOObjectNode : TreeNode;
{
	FileSystemInfo info;
	FileInfo file;
	DirectoryInfo folder;
	ArchiveDirectoryInfo virtualFolder;
	ArchiveFileInfo virtualFile;

	IEntry entry;
	public string FileName { get { return info.Name; } }
	public string Path { get { return System.IO.Path.GetDirectoryName(info.FullName); } }
	public string FullName { get { return info.FullName; } }
	public DateTime LastWriteTime { get { return info.LastWriteTime; } }
	public DateTime CreationTime { get { return info.CreationTime; } }
	public long Size { get { if (file != null) return file.Length; else return 0; } }
	public long Length { get { return Size; } }
	public IOObjectNode() { }
	public void Populate(IEntry entry) { SharpEntry = entry; }
	public void Populate(FileSystemInfo info) { ShellInfo = info; }

	public FileSystemInfo ShellInfo
	{
		get { return info; }
		protected set
		{
			info = value;
			file = value as FileInfo;
			folder = value as DirectoryInfo;
			virtualFolder = value as ArchiveDirectoryInfo;
			virtualFile = value as ArchiveFileInfo;

			UpdateResources();
		}
	}

	public IEntry SharpEntry
	{
		get { return entry; }
		protected set
		{
			entry = value;
			UpdateResources();
		}
	}
}

When I pushed the Transfer button a second time, I get the this error message, System.InvalidOperationException: 'This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.' Can someone help me with this problem?

private void buttonTransfer_Click(object sender, EventArgs e)
        {

                if (backgroundWorker1.IsBusy)
            {
                backgroundWorker1.WorkerSupportsCancellation = true;
                backgroundWorker1.CancelAsync();
                MessageBox.Show("Running!");
            }

                    richTextBoxViewStatus.Clear();
                    
            backgroundWorker1.WorkerReportsProgress = true;
            backgroundWorker1.RunWorkerAsync();

        }


private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            port.Close();
            backgroundWorker1.WorkerSupportsCancellation = true;
            backgroundWorker1.CancelAsync();
        }

      

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
        do some work
        }

Quote:

IDE: Integrated development environment
C#, Visual Studio 2019, Windows10Pro in
2.1

C#

Exception: An object reference does not point to an instance of an object.

Quote:

using System;
using System.IO;
using System.Text;
// - using System.Text.StringBuilder;
using System.Globalization;
using System.Windows.Forms;

using System.Threading;

// using Microsoft.CSharp;

namespace WFA_BankPercent
{
public partial class Form7 : Form
{
public Form7()
{
InitializeComponent();
}
//- string m_sWork44 = ""; // C# требует инициализации
private void Form7_Load(object sender, EventArgs e)
{

}

// below on forum www.codeproject.com 29032022
private void button21_Click(object sender, EventArgs e)
{
string line = System.String.Empty;
string s_sourse = System.String.Empty;
bool b_beforeRead = false;
bool b_afterRead = false;
string s_begin = "Begin";
string s_end = "End";
bool b_begin = false;
bool b_end = false;
int i_begin = 0;
int i_end = 0;
try
{
StreamReader sr = new StreamReader(@"D:\Input_my.txt");
StreamWriter sw = new StreamWriter("D:\\Out_my.txt", false, Encoding.UTF8);
line = sr.ReadLine();
byte k = 0; // temporary for debug

while (line != null)
{
// k++; // temporary
// //+if (k > 6) // read only the first 6 lines of the input file
////+ if (k > 17) // 15 lines were written to the output file, but there was no Exception
// if (k > 18) // 0 lines were written to the output file, Exception was
// goto Close_my;

if ((line.Trim().Length == 0))
goto label_read;

b_begin = line.Contains(s_begin);
b_end = line.Contains(s_end);

if (b_begin && b_end)
{
i_begin = line.IndexOf(s_begin);
i_end = line.IndexOf(s_end);
s_sourse = line.Substring(0, i_begin);
MessageBox.Show("in line found 'Begin' and 'End'\n" + line);
goto label_wr;
}
else
{
s_sourse = line;
goto label_wr;
}
goto label_read;

label_wr:
sw.WriteLine(s_sourse);
label_read:
b_beforeRead = line.Contains(s_begin);
line = sr.ReadLine();
b_afterRead = line.Contains(s_end);
} // end while (line != null)
Close_my:
line = sr.ReadLine();
MessageBox.Show("Does it get here?" + s_sourse);
sr.Close();
sw.Close();
} // end try
catch (Exception e1)
{
MessageBox.Show("2.1 Exception: " + e1.Message);
}
finally
{
MessageBox.Show("3.Executing finally block.");
}
} // end button21
}
}