Select DataTable rows with where LINQ C#

C# > LINQ > Where

Where filters a sequence of values based on a predicate. 

Example

Select DataTable rows with where.

DataTable dt = new DataTable();

dt.Columns.Add("name", typeof(string));

dt.Rows.Add("john");

dt.Rows.Add("dan");

var filteredRows = dt.Rows

                  .Cast<DataRow>()

                  .Where(r => r["name"] == "dan").ToList();

Create new directory with DirectoryInfo C#

C# > Files > DirectoryInfo Class

Use this class for create, move and enumerating directories and subdirectories. 

Example 

Create new directory

DirectoryInfo directoryInfo = new DirectoryInfo(@"c:\Yourdir");

try

{

if (!directoryInfo.Exists)

       {

              directoryInfo.Create();

       }

}

catch (Exception ex)

{

MessageBox.Show("DirectoryInfo error: {0}", ex.ToString());

}

finally { }

Get Directory Size C#

C# > IO  > FileInfo > Length

Get the size of the file in bytes. 

Example

Get Directory Size C#

public long DirectorySize(DirectoryInfo dir)

{

       long size = 0;

       foreach (FileInfo file in dir.GetFiles())

       {

              size += file.Length;

       }

      foreach (DirectoryInfo directory in dir.GetDirectories())

       {

              size += DirectorySize(directory);

       }

       return size;

 }

DirectoryInfo dir = new DirectoryInfo(@"C:\Temp");

long size = DirectorySize(dir);

C# Capture Screen to PictureBox

C# > Drawing > Capture Screen

Bitmap printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);

Graphics graphics = Graphics.FromImage(printscreen as Image);

graphics.CopyFromScreen(0, 0, 0, 0, printscreen.Size);

using (MemoryStream s = new MemoryStream())

{

printscreen.Save(s, System.Drawing.Imaging.ImageFormat.Bmp);

       picCapture.Size = new System.Drawing.Size(this.Width, this.Height);

       picCapture.Image = Image.FromStream(s);

}

XmlDocument C# Example

C# > XML > XmlDocument

Represents an XML document.

Example

XmlDocument doc = new XmlDocument();

doc.Load(xmlfile);

NetworkChange Class C#

C# > System.Net > NetworkInformation > NetworkChange

Use this class to receive notification when the IP address of a network interface changes.
Changes can appears when:

• disconnect network cable
• out of range of a wireless Local Area Network
• hardware failure

Events:

• NetworkAvailabilityChanged

C# NetworkInformation NameSpace

C# > System.Net > NetworkInformation

Provides access to network address information and traffic data.

Classes

• NetworkChange