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TextBox.SelectionStart = 5;

This set caret position on TextBox to 5 char.

If you are working within a form you can use this to find it:

if (this.ActiveControl.Equals(testControl)

{

//......

}

During my work on the VS.NET project It was necessity to use a component such action “Google search ComboBox”. All data bound in the component can be completed by the “DataSource source”.

The component appears in the following way:

MaxtradeCombo dotNet Component

“UserControl” component is composed of a “TextBox” and a “ListBox”, which combined look like “ComboBox” and working as a “Google searchbox”.
The added component Properties are – How to search the “DataSource”.

This Component is freeware, and you are free to use and change at your discretion.

download: MaxtradeCombo (122.60KB) added: 05/08/2009 clicks: 69 description: MaxtradeCombo is a "google searcbox" like dotNet Component

C# how to obtain current direntory of the executing process:

System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
[/c-sharp]

How to change the visual presentation of the scope of DataGridView. If in a particular field of the table in the database have such a unix timestamp value like visualizing it as a standard date and time. Add EventHandler CellFormating for the DataGridView.

private void dgvActiveUsers_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
  try
  {
    if (dgvActiveUsers.Columns[e.ColumnIndex].Name.Equals("logindate"))
    {
      DateTime origin = new DateTime(1970, 1, 1, 0, 0, 0, 0);
      e.Value = origin.AddSeconds(double.Parse(e.Value.ToString())).ToShortDateString() + " - " + origin.AddSeconds(double.Parse(e.Value.ToString())).ToShortTimeString();
     }
   }
   catch (Exception)
   {
   }
}

This method can give an idea and many other types of formatting values.

A method to programaticaly opening folder with explorer:

string folderToOpen = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + @"\archive";
string windir = Environment.GetEnvironmentVariable("SystemRoot");
System.Diagnostics.Process proccess = new System.Diagnostics.Process();
proccess.StartInfo.FileName = windir + @"\explorer.exe";
proccess.StartInfo.Arguments = folderToOpen;
proccess.Start();
[/c-sharp]

String variable folderToOpen contains path to “archive” folder under this folder in which the program works.
proccess.StartInfo.FileName contains path to “windows explorep”.

A class to create ZIP file from another file.
This class uses the free C# ZIP library (http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx) is great for reading and creating ZIP files.
The parameter source is full path to source file.
The parameter destination is full path to destination result zip file.

using System;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;

namespace Tools
{
  public class Zip
  {
   public static void create(string source, string destination, string comment)
    {
      Crc32 crc = new Crc32();
      ZipOutputStream s = new ZipOutputStream(File.Create(@destination));
      s.SetLevel(9); // 0 - store only to 9 - means best compression
      FileStream fs = File.OpenRead(@source);
      byte[] buffer = new byte[fs.Length];
      fs.Read(buffer, 0, buffer.Length);
      ZipEntry entry = new ZipEntry(ZipEntry.CleanName(@source));
      entry.DateTime = DateTime.Now;
      entry.Comment = comment;
      entry.ZipFileIndex = 1;
      entry.Size = fs.Length;
      fs.Close();
      crc.Reset();
      crc.Update(buffer);
      entry.Crc = crc.Value;
      s.PutNextEntry(entry);
      s.Write(buffer, 0, buffer.Length);
      s.Finish();
      s.Close();
    }
  }
}

A function to executing the batch file from C#
The value of the first argument [batchFileName] is full path to batch file.
The value of the second argument [argumentsToBatchFile] is array of argument if exist, sending to batch file.

protected bool ExecuteBatchFile(string batchFileName, string[] argumentsToBatchFile)
{
string argumentsString = string.Empty;
try
{
if (argumentsToBatchFile != null)
{
for (int count = 0; count < argumentsToBatchFile.Length; count++)
{
argumentsString += " ";
argumentsString += argumentsToBatchFile[count];
}
}

System.Diagnostics.ProcessStartInfo DBProcessStartInfo = new  System.Diagnostics.ProcessStartInfo(batchFileName, argumentsString);

DBProcessStartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
DBProcessStartInfo.UseShellExecute = true;

System.Diagnostics.Process dbProcess;
dbProcess = System.Diagnostics.Process.Start(DBProcessStartInfo);

while (!dbProcess.HasExited)
dbProcess.WaitForExit(2000);

return true;
}
catch (SqlException ex)
{
MessageBox.Show(ex.Message);
return false;
}
}

In most of my projects i use format string for dates like this:

d - Numeric day of the month without a leading zero.
dd - Numeric day of the month with a leading zero.
ddd - Abbreviated name of the day of the week.
dddd - Full name of the day of the week.

f,ff,fff,ffff,fffff,ffffff,fffffff -
	Fraction of a second. The more Fs the higher the precision.

h - 12 Hour clock, no leading zero.
hh - 12 Hour clock with leading zero.
H - 24 Hour clock, no leading zero.
HH - 24 Hour clock with leading zero.

m - Minutes with no leading zero.
mm - Minutes with leading zero.

M - Numeric month with no leading zero.
MM - Numeric month with a leading zero.
MMM - Abbreviated name of month.
MMMM - Full month name.

s - Seconds with no leading zero.
ss - Seconds with leading zero.

t - AM/PM but only the first letter.
tt - AM/PM ( a.m. / p.m.)

y - Year with out century and leading zero.
yy - Year with out century, with leading zero.
yyyy - Year with century.

How to find IP address and Host name of computer running a program of C #.
Get Host name:

String strHostName ="";
// Get the host name of local machine.
strHostName = Dns.GetHostName();

Get IP addresses:

IPHostEntry ipEntry = DNS.GetHostByName(strHostName);
IPAddress [] addr = ipEntry.AddressList;
for (int i = 0; i > addr.Length; i++)
{
   MessageBox.show("IP Address " + i.ToString() + ": " + addr[i].ToString());
}