TRY_CAST SQL Server Example

SQL Server > Built-in Functions > TRY_CAST

Try to cast a value to the specified data type. 
If the cast not succeeds returns null.

Example

SELECT

    CASE WHEN TRY_CAST('1' AS float) IS NULL

    THEN 'Cast failed'

    ELSE 'Cast succeeded'

END AS Result;

Result

Cast succeeded

SELECT

    CASE WHEN TRY_CAST('xx' AS float) IS NULL

    THEN 'Cast failed'

    ELSE 'Cast succeeded'

END AS Result;

Result

Cast failed

Pow C# Example

C#  > System > Math class > Pow

Pow  number raise a  number to the specified power.

Example:

double pow = Math.Pow(2, 8); // 256

Scroll to selected index DataGridView

C# > DataGridView > FirstDisplayedScrollingRowIndex 

Setting this property raises scroll event to match selected index.

Example

dataGridView1.FirstDisplayedScrollingRowIndex = dataGridView1.Rows.Count - 1;

Read fast text file line by line C#

C# > Files > File Class > OpenText

Open text file for reading line by line.

Example

Read fast text file line by line C#

using (StreamReader sr = File.OpenText(@"c:\filename.txt"))

{

   while (!sr.EndOfStream)

   {

     sr.ReadLine();

    }
}

INSERT SQL Server Example

SQL Server > DML > INSERT

INSERT adds one or more rows to a table or a view.

• When insert data into a view, the view must reference exactly one base table in the FROM clause of the view. 
• When insert into a multi-table view you must use a column list that references only columns from one base table. 

Example

INSERT INTO Sales (ProductName, Price, [Date])
VALUES ('Product1', 200, GETDATE());

How to bind to a parent DataContext WPF

WPF > RelativeSource

IsEnabled="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.IsAPGCSourceFitted}"

Day VB.Net Example

VB.NET > Functions > Day

Day returns the day of the month as an integer between 1 and 31.

Example


Dim today As Integer = Microsoft.VisualBasic.DateAndTime.Day(Now)

C# Regex to match the words with dot

C# > Text > Regular Expressions > Split with dot


 string[] substrings = Regex.Split("test.regex.dot", @"\.");

Remove border Telerik RadGridView

Telerik > RadGridView > Remove border

radGridView1.GridViewElement.DrawBorder = false;

radGridView1.GridViewElement.GroupPanelElement.DrawBorder = false;

KeyNotFoundException Collection C# Example

Collections > Generic > KeyNotFoundException 

This is thrown when try to retrieve an element from a collection using a key that does not exist in that collection.

Example

   Dictionary<string, string> dict = new Dictionary<string, string>();

   dict.Add("key1","value1");

   try

   {

       string val = dict["key2"];

   }

   catch (KeyNotFoundException)

   {

       throw new KeyNotFoundException("KeyNotFoundException!");

   }

Print PictureBox Image C# Example Using PrintDocument

C# > Print  > PrintDocument

PrintDocument sends out to the printer.


Example

Print image

using System;

using System.Drawing;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            printPreviewDialog1.Document = printDocument1;

            printPreviewDialog1.ShowDialog();

        }

        private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)

        {

            e.Graphics.DrawImage(pictureBox1.Image, 100, 100, 700, 600);
        }
    }
}

System tables SQL Server

SQL Server > System tables

• sysobjects

Subtract SQL Server example

SQL Server > Operators > Subtract

- Operator (minus) subtracts two numbers or a number (in days) from date.





Example

1. Subtracts values from 2 numeric columns

create table #test(value int, fee int)
insert into #test(value, fee) values (500,50),(100,10)
  select 
   value - fee as 'diff'
  from 
   #test
drop table #test

Result
diff
450
90

2. Subtracts from date

SELECT getdate() - 1 AS 'Subtract Date';

C# unit test using Moq verify property has been set

C# > Unit test > Moq > Verify property has been set

SetupSet : Specifies a setup on the mocked type for a call to a property setter.

VerifySet : Verifies that a property has been set on the mock, regardless of its value.

Example

using System;

namespace UnitTestProject1

{

    public interface Interface1

    {

        int Id { get; set; }

    }

}

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Moq;

namespace UnitTestProject1

{

    [TestClass]

    public class UnitTest1

    {

        [TestMethod]

        public void TestMethod1()

        {

            var mocker = new Mock<Interface1>();

            mocker.SetupSet(x => x.Id = 1);

            mocker.Object.Id = 1;

            mocker.VerifySet(x => x.Id);

        }

    }

}

Convert string to date C# example

C# > System Namespace > DateTime > Parse

Parse converts string to a date.

Example

string value = "5/15/2015";

var dte = DateTime.Parse(value, CultureInfo.InvariantCulture); // {5/15/2015 12:00:00 AM}

Find last row Telerik RadGridView

Telerik > RadGridView > Find last row

GridViewRowInfo lastRow = radGridView.Rows[radGridView.Rows.Count - 1];
lastRow.IsSelected = true;

C# Generic Interface Example

C# > Generics > Generic Interface 

Example

class Serializer1 { public string Name { get; set; } };

class Serializer2 { public string Name { get; set; } };

interface GenericSerializer<T>

{

      string Name(T tValue);

}

class Serializer<T>: GenericSerializer<T>

{

public string Name(T tValue)

        {

            var prop = tValue.GetType().GetProperty("Name");

            return prop.GetValue(tValue, null) as string;

        }

}

Serializer1 s1 = new Serializer1() { Name = "Serializer1" };

Serializer2 s2 = new Serializer2() { Name = "Serializer2" };

Serializer<Serializer1> serializer1 = new Serializer<Serializer1>();

string name1 = serializer1.Name(s1);

Serializer<Serializer2> serializer2 = new Serializer<Serializer2>();

string name2 = serializer2.Name(s2);

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>