Dot Net - Masty: 2012

Friday, 24 August 2012

Substring() in C#

Example On String Substring() method.

Substring in C# string Class returns a new string that is a substring of this string. The substring begins at the specified given index and extended up to the given length.

Syntax : string string.substring(int startIndex,int length)

Parameters:

startIndex: The index of the start of the substring.

length: The number of characters in the substring.

public class SubstringExample

{

public static void Main()

{

string str = null;

string SubStr = null;

str = "Dotnet Masty Substring Example";

SubStr = str.Substring(7, 15);

Console.WriteLine(SubStr);

Console.ReadLine();

}

Thursday, 23 August 2012

String Copy() and CopyTo() in C#

Example on String Copy() and CopyTo() Method.

Copy() :

CSharp String Copy method is create a new String object with the same content.

Syntax: string string.Copy(string str)

Parameters:

String str : The argument String for Copy method.

CopyTo() :

CSharp string CopyTo method Copies a specified number of characters from a specified position in this instance to a specified position in an array of characters.

Syntax: void string.CopyTo(int sourceIndex,char[] destination, int destinationindex,int count)

Parameters:

int sourceIndex : The starting position of the source String

char[] destination : The character Array

int destinationindex : Array element in the destination
int count : The number of characters to destination

public class StringCopy&CopyToExample

{

public static void Main()

{

//Copy() Methode

string strCopy1 = null;

string strCopy2 = null;

strCopy1 = "C# Copy() Method test";

strCopy2 = string.Copy(strCopy1);

Console.WriteLine(strCopy2);

//MessageBox.Show(str2);

//CopyTo() Methode

string strTo = "C#CopyTo() sample";

char[] chrs = new char[5];

strTo.CopyTo(0, chrs, 0, 5);

Console.WriteLine(chrs[0].ToString() + chrs[1].ToString() + chrs[2].ToString()+ chrs[3].ToString() + chrs[4].ToString() + chrs[5].ToString());

Console.ReadLine();

}

String Clone() in C#

Example on String Clone() Method.

The C# String Clone() method creates and returns a copy of string object. This methode returns a reference to this instance of string.

public class StringCloneExample

{

public static void Main()

{

string Str = "Clone Methode Testing";

string StrCloned = null;

StrCloned = (String)Str.Clone();

Console.WriteLine(StrCloned);

Console.ReadLine();

}

String Split in C#

Example on Split String using C#

C# string Split function returns an array of String containing the substrings delimited by the given System.Char array.

public class StringSplitExample

{

public static void Main()

{

string str = null;

string[] strArr = null;

int count = 0;

str = "Dot Net Masty";

char[] splitchar = { ' ' };

strArr = str.Split(splitchar);

for (count = 0; count <= strArr.Length - 1; count++)

{

Console.WriteLine(strArr[count]);

}

Console.ReadLine();

}

String.Compare Methods in C#

Different types of String Compare Methods Examples

public class StringCompareExample

{

public static void Main()

{

string s1 = "Dot\u00ADNet"; // '\u00AD' Unicode Character 'SOFT HYPHEN'

string s2 = "DotNet";

Console.WriteLine("Comparison of '{0}' and '{1}': {2}", s1, s2, String.Compare(s1, s2, true));

Console.WriteLine("2nd Example : ");

String MyString = "Hello World1";

String OtherString = "Hello World";

int MyInt = MyString.CompareTo(OtherString);

Console.WriteLine( MyInt );

Console.WriteLine("3rd Example : ");

string MyString1 = "Hello World";

string YourString = "Hello World1";

Console.WriteLine(String.Equals(MyString1, YourString));

Console.WriteLine("4th Example : ");

string MyString2 = "Hello World";

Console.WriteLine(MyString2.StartsWith("Hello"));

// String.Compare Methods

Console.WriteLine("5th Example : ");

string str1 = null;

string str2 = null;

str1 = "csharp";

str2 = "CSharp";

int result = 0;

result = string.Compare(str1, str2);

Console.WriteLine(result.ToString());

result = string.Compare(str1, str2, true);

Console.WriteLine(result.ToString());

result = string.Compare(str1, str2, false);

Console.WriteLine(result.ToString());

Console.ReadLine();

}

Differences in string compare methods using C#

Different types of String Compare methods

public class Example

{

public static void Main()

{

string testString1 = "String1";

string testString2 = "String2";

if (testString1.CompareTo(testString2) == 0) //or 1

{

//Condition

}

if (testString1.Equals(testString2))

{

//Condition

}

if (testString1 == testString2)

{

//Condition

}

Console.ReadLine();

}

Friday, 8 June 2012

LINQ To SQL Insert,Update,Delete

The process of inserting updating and deleting from LinQ to SQL.

Create Database name (LINQ2SQL)

USE [LINQ2SQL]

CREATE TABLE [dbo].[Department](

[Id] [int] IDENTITY(1,1) NOT NULL,

[DeptName] [varchar](50) NULL,

CONSTRAINT [PK_Department] PRIMARY KEY CLUSTERED

(

[Id] ASC

)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

) ON [PRIMARY]

SET ANSI_PADDING OFF

/****** Object: Table [dbo].[Employee] Script Date: 06/08/2012 16:05:13 ******/

SET ANSI_NULLS ON

SET QUOTED_IDENTIFIER ON

SET ANSI_PADDING ON

CREATE TABLE [dbo].[Employee](

[Id] [int] IDENTITY(1,1) NOT NULL,

[EmpName] [varchar](50) NULL,

[Salary] [varchar](50) NULL,

[DeptId] [int] NULL,

CONSTRAINT [PK_Employee] PRIMARY KEY CLUSTERED

(

[Id] ASC

)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

) ON [PRIMARY]

SET ANSI_PADDING OFF

/****** Object: ForeignKey [FK_Employee_Department] Script Date: 06/08/2012 16:05:13 ******/

ALTER TABLE [dbo].[Employee] WITH CHECK ADD CONSTRAINT [FK_Employee_Department] FOREIGN KEY([DeptId])

REFERENCES [dbo].[Department] ([Id])

ALTER TABLE [dbo].[Employee] CHECK CONSTRAINT [FK_Employee_Department]

Creating a LINQ 2 SQL class to Map Tables

Take One Class Library from New Projects name it as DAL.

Right click on project from solution explorer and Add New Item LINQ to SQL Classes

Create connection from Server Explorer by right click on the data connection and drag and drop the tables.

Build The application.

Implementing the LinQ through Code Behind

Take One Web Application from New Projects.
Right click on the Project from solution explorer and click on Add References.
And Select the builded DAL application's DAL.dll file from Browse -> DAL -> Bin -> Debug-> DAL.dll.

in Default.aspx page.

<tr>

DepartMent Name

</td>

<td>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

</td>

<td>

<asp:Button ID="Button1" runat="server" Text="Save" Width="100" OnClick="Button1_Click" />

</td>

</tr>

<tr>

Department

</td>

<td>

<asp:DropDownList ID="DropDownList1" runat="server" Width="130px" AutoPostBack="True">

</asp:DropDownList>

</td>

</tr>

<tr>

Employee Name

</td>

<td>

<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

<asp:HiddenField ID="HiddenField1" runat="server" />

</td>

</tr>

<tr>

Employee Sal

</td>

<td>

<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>

</td>

</tr>

<tr>

<asp:Button ID="Button2" runat="server" Text="Save" Width="100" OnClick="Button2_Click" />

</td>

<td>

<asp:Button ID="Button3" runat="server" Text="Update" Width="100" OnClick="Button3_Click" />

<asp:Button ID="Button4" runat="server" Text="Delete" Width="100" OnClick="Button4_Click" />

</td>

</tr>

</table>

</br>

<asp:GridView ID="GridView1" runat="server" Width="487px" AutoGenerateSelectButton="True"

OnSelectedIndexChanged="GridView1_SelectedIndexChanged" CellPadding="4"

ForeColor="#333333" GridLines="None">

</asp:GridView>

in Default.aspx.cs page.

Add the Namespace DAL

using DAL;

using System.Linq;

public partial class _Default : System.Web.UI.Page

{

ExampleDALDataContext contextVar = new ExampleDALDataContext();

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

fillDropdown();

FillGrid();

}

// Adding The Department in DB

protected void Button1_Click(object sender, EventArgs e)

{

Department depart = new Department()

{

DeptName = TextBox1.Text

};

contextVar.Departments.InsertOnSubmit(depart);

contextVar.SubmitChanges();

fillDropdown();

TextBox1.Text = string.Empty;

}

// Inserting the Employee Details in Employee Table

protected void Button2_Click(object sender, EventArgs e)

{

Employee empy = new Employee()

{

DeptId = int.Parse(DropDownList1.SelectedValue),

EmpName = TextBox2.Text,

Salary = TextBox3.Text

};

contextVar.Employees.InsertOnSubmit(empy);

contextVar.SubmitChanges();

TextBox3.Text = string.Empty;

TextBox2.Text = string.Empty;

FillGrid();

}

// Updating the Employee Details in Employee Table

protected void Button3_Click(object sender, EventArgs e)

{

var EditEmp = contextVar.Employees.Single(x => x.Id == int.Parse(HiddenField1.Value));

EditEmp.DeptId = int.Parse(DropDownList1.SelectedValue);

EditEmp.EmpName = TextBox2.Text;

EditEmp.Salary = TextBox3.Text;

contextVar.SubmitChanges();

TextBox3.Text = string.Empty;

TextBox2.Text = string.Empty;

FillGrid();

}

// Deleting the Employee Details in Employee Table

protected void Button4_Click(object sender, EventArgs e)

{

var DeleteEmp = contextVar.Employees.Single(x => x.Id == int.Parse(HiddenField1.Value));

contextVar.Employees.DeleteOnSubmit(DeleteEmp);

contextVar.SubmitChanges();

TextBox3.Text = string.Empty;

TextBox2.Text = string.Empty;

FillGrid();

}

void fillDropdown()

{

DropDownList1.Items.Clear();

DropDownList1.DataSource = contextVar.Departments.OrderByDescending(x => x.Id);

DropDownList1.DataTextField = "DeptName";

DropDownList1.DataValueField = "Id";

DropDownList1.DataBind();

}

void FillGrid()

{

var gdata = from ep in contextVar.Employees

select new

{

Id = ep.Id.ToString(),

Name = ep.EmpName,

Salary = ep.Salary,

Department = ep.Department.DeptName

};

GridView1.DataSource = gdata;

GridView1.DataBind();

}

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)

{

HiddenField1.Value = GridView1.SelectedRow.Cells[1].Text;

TextBox2.Text = GridView1.SelectedRow.Cells[2].Text;

TextBox3.Text = GridView1.SelectedRow.Cells[3].Text;

}