LINQ Average excluding or including zeros c#

C# > LINQ > Average


Average computes the average of a sequence of numeric values.

Example

int[] int_array = new int[] { 5, 4, 2, 8, 10, 0 };

// linq average excluding zeros

double avg =

       (from ord in int_array

        where ord > 0

        select ord).Average();  // 5.8

// linq average including zeros 

avg =

       (from ord in int_array

       select ord).Average();    // 4.83

UPDATE SQL Server Example

SQL Server > DML > UPDATE

Changes existing data in a table or view.


Example

update

   person
set
   name = 'Bill'
where 
   id = 1

Reflection to find all classes implementing interface c#

C# > Reflection >  Find classes implementing interface

var iTtype = typeof(Interface);

var types = AppDomain.CurrentDomain.GetAssemblies()

           .SelectMany(a => a.GetTypes())

           .Where(t => iTtype.IsAssignableFrom(t));

Telerik GridViewCheckBoxColumn Alignment

Telerik > Windows Forms > RadGridView > GridViewCheckBoxColumn

GridViewCheckBoxColumn displays and allows editing of 

boolean data.

Example

GridViewCheckBoxColumn Alignment

<telerik:GridViewCheckBoxColumn DataMemberBinding="{Binding IsManager}" >

    <telerik:GridViewCheckBoxColumn.CellStyle>

        <Style TargetType="telerik:GridViewCell">

            <Setter Property="HorizontalContentAlignment" Value="Center" />

        </Style>

    </telerik:GridViewCheckBoxColumn.CellStyle>

</telerik:GridViewCheckBoxColumn>

Calculate SQL Server row size for a table

SQL Server > Scripts > Row Size

create table ##RowSize (tableName nvarchar(50), rowSize int)

exec sp_msforeachtable 'INSERT INTO ##RowSize Select ''?'' As tableName, SUM(c.Length) from dbo.SysColumns c where c.id = object_id(''?'') '

select * from ##RowSize order by rowSize  desc

drop table ##RowSize

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();

        }

    }

}