Complete Comparison for VB.NET and C#

Visual Basic [.NET] (VB.NET) is a multi-paradigm, high-level programming language, implemented on the .NET Framework. Microsoft launched VB.NET in 2002 as the successor to its original Visual Basic language.

C# (pronounced "C-sharp") is an object-oriented programming language from Microsoft that aims to combine the computing power of C++ with the programming ease of Visual Basic. C# is based on C++ and contains features similar to those of Java. C# is designed to work with Microsoft's .Net platform.

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VB.Net Namespace

Imports System.Data

Imports System.Data.SqlClient

Imports System.IO

C# Namespace

using System.Data;

using System.Data.SqlClient;

using System.IO;

VB.NET Page Load 

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load

      

    End Sub

C# Page Load 

protected void Page_Load(object sender, EventArgs e)

    {     

    }

VB.NET Varibles

Dim str As String

str = "VB.NET"

  

Dim cmd As SqlCommand = New SqlCommand()

Dim con As SqlConnection = New SqlConnection()

C# Varibles

SqlCommand cmd = new SqlCommand();

SqlConnection con = new SqlConnection();

string str="";

str="C#";

VB.NET Database ConnectionString

Dim con As SqlConnection = New SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings("dbcon").ConnectionString)

       

con.Open()

C# Database ConnectionString

SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["dbcon"].ToString());

        con.Open();

VB.NET If Condition

 Dim s As String = "VB.NET"

        If s = "VB.NET" Then

            Response.Write("Success")

        Else

            Response.Write("Not Success")

        End If

C# If Condition

string s = "C#";

        if (s == "C#")

        { 

            Response.Write("Success");

        }

        else

        {

            Response.Write("Not Success");

        }

VB.NET Function/Methods

Public Sub bind()

    End Sub

Protected Sub bind()

    End Sub

Private Sub bind()

    End Sub

C# Function/Methods

Public void bind()

{

}

Protected void bind()

{

}

Private void bind()

{

} 

VB.NET  WebForm Call

        Response.Redirect("Login.aspx")

C#  WebForm Call

        Response.Redirect("Login.aspx");

VB.NET Image Upload to Server Folder

Dim imgname As String = FileUpload1.PostedFile.FileName

            FileUpload1.SaveAs(Server.MapPath("img/" + imgname))

 C# Image Upload to Server Folder

 String imgname = FileUpload1.PostedFile.FileName;

            FileUpload1.SaveAs(Server.MapPath("img/" + imgname));

VB.NET Access Session

            lbtUsername.Text = Session("username").ToString()

C# Access Session

      lbtUsername.Text = Session["username"].ToString();

VB.NET Access Gridview Events

Protected Sub Button1_Click(sender As Object, e As EventArgs)

        Dim btn As Button = CType(sender, Button)

        Dim row As GridViewRow = CType(btn.NamingContainer, GridViewRow)

        Dim lblAmount1 As String = DirectCast(row.FindControl("Label2"), Label).Text   

    

    End Sub

// Gridview events

        Dim lblid As String = DirectCast(GridView22.Rows(e.RowIndex).FindControl("Label2"), Label).Text

C# Access GridView Events

protected void Button1_Click(object sender, EventArgs e)

    {

        Button btn = (Button)sender;

        GridViewRow row = (GridViewRow)btn.NamingContainer;

        Label lblAmount1 = (Label)row.FindControl("Label2");

    }

 // Gridview events

Label lblid = (Label)GridView1.Rows[e.RowIndex].FindControl("Label2");

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What is the Difference between Eval() and Bind Methods

	Eval()	Bind()
1	Eval() Supports  one way Binding only.	Bind() Supports Two Way Binding.
2	Only Read data from Columns	Bind() we can Read & Write data From Column.
3	Eval() Control like the GridView or the FormView display Read only data using a label control	Bind () proper type of datasource, it will pull the altered values out of the GridView or other control .
4	Eval() Use without id control. Ex: <table><tr><td> <%#Eval("username")%> </td></tr></table>	Bind() Use Any Like any  Controls. Ex: <ItemTemplate>                         <asp:Label ID="lblUsername" runat="server" Text='<%# Bind("username") %>'></asp:Label> </ItemTemplate>

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Difference Between For Loop and ForEach Loop Using C#

Difference Between For Loop and ForEach Loop

	For Loop	ForEach Loop
1	For Loop Variable Always int Only.	ForEach Loop Variable Same as Type of Values Under Array.
2	For loop Iterates a Statement or a Block of Statements Repeatedly until a Specified Expression Evaluates to False.	For-each loop is used to Iiterate through the Items in Object Collections, List Generic Collections or Array List Collections.
3	For Loops are Faster Than For Each Loop.	For Each Loop are Slower Than For Loop.
4	Need To Loop Bounds (Minimum,Maximum). Ex: int count=0; int j; for(int i=0;i<=5;i++) {    j=count+1; }	No Need To Loop Bounds Minimum or Maximum. EX: int z=0; int [] a=new int[]      {0,1,2,3,4,5};     foreach(int i in a)     {     z=z+1;     }

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Difference Between Primary Key and Foreign Key in SQL

Difference Between Primary Key and Foreign Key 

	Primary Key	Foreign Key
1	Primary Key Can Not Accept Null Values.	Foreign Key Can Accept Multiple Null Values.
2	Only One Primary Key in a Table.	More than One Foreign Key in a Table.
3	Primary Key Uniquely Identify a Record in the Table	Foreign Key is a Field in the Table that is Primary Key in Another Table
4	Primary Key is Clustered Index. Ex: CREATE TABLE [country] (     [id]      INT          IDENTITY (1, 1) NOT NULL,        [name] VARCHAR (50) NOT NULL,     UNIQUE NONCLUSTERED ([name],     CONSTRAINT [PK_country] PRIMARY KEY CLUSTERED ([id]) );	Foreign Key is Non-Clustered Index. Ex: CREATE TABLE [reg] (        [country]  VARCHAR (50) NOT NULL,     [name]     VARCHAR (50) NOT NULL,     CONSTRAINT [FK_reg_country] FOREIGN KEY ([name]) REFERENCES [dbo].[country] ([name]) );

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