Remove database SQL Server with sp_dbremove

SQL Server > System Stored Procedures > sp_dbremove

Removes a database.

Example

EXEC sp_dbremove HR;

Write, read XML to memory stream using XmlWriter and XmlReader C#

C# > XML > XmlWriter

XmlWriter  writes XML data to a file, stream,, text reader, or string.
It is fast, noncached and forward only.

Example
Write/read XML to memory stream.

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Xml;

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            MemoryStream stream = new MemoryStream();

            XmlWriter writer = XmlWriter.Create(stream);

            writer.WriteStartDocument();

            writer.WriteStartElement("Root");

            writer.WriteElementString("Child", "1");

            writer.WriteEndElement();

            writer.WriteEndDocument();

            writer.Flush();

            writer.Close();

            stream.Position = 0; // Resets the position to 0 so we can read.

            XmlReader reader = XmlReader.Create(stream);

            while (reader.Read())

            {

                //

            }

            reader.Close();

        }

    }

}

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);