Skip to main content

Featured Post

How to use Tabs in ASP.NET CORE

I want to show Components in a tabs , so first of all create few components. In this project we have three components, First View Component  public class AllViewComponent : ViewComponent     {         private readonly UserManager<ApplicationUser> _userManager;         public AllViewComponent(UserManager<ApplicationUser> userManager)         {             _userManager = userManager;         }         public async Task<IViewComponentResult> InvokeAsync()         {             List<StudentViewModel> allUsers = new List<StudentViewModel>();             var items = await _userManager.Users.ToListAsync();             foreach (var item in items)             {                 allUsers.Add(new StudentViewModel {Id=item.Id, EnrollmentNo = item.EnrollmentNo, FatherName = item.FatherName, Name = item.Name, Age = item.Age, Birthdate = item.Birthdate, Address = item.Address, Gender = item.Gender, Email = item.Email });             }            

How to use LINQ to SQL in ASP.NET

INTRODUCTION

LINQ to SQL is a component of .NET Framework, and is specifically designed for working with SQL server database. It provides a run-time infrastructure for managing relational data as objects. It allows you to write queries to retrieve and manipulate data from the SQL server. LINQ to SQL supports all the key functions that you would expect while developing SQL applications. You can retrieve the data from the database, insert, update, and also delete the information from the table. Your query expression is translated into parameterized SQL code, parameters are created, and the query is executed on the server. LINQ to SQL also supports transactions, views, and stored procedures. It also provides an easy way to integrate data validation and business logic rules into your data model.

LINQ to SQL is an object-relational mapping (ORM) framework that allows the direct 1-1 mapping of a Microsoft SQL Server database to .NET classes, and query of the resulting objects using LINQ. With the help of LINQ to SQL ORM mapping, the classes that match the database table are created automatically from the database itself and you can start using the classes immediately.

Let's take an simple Example

Step-1 : Add a LINQ to SQL class to the application 
Step-2 : Right-click the Solution name in the solution explorer and select Add New Item from The context menu. This will open the Add New Item dialog box.
Step-3 : In the dialog box, select LINQ to SQL Classes and rename the file as my.dbml. Default name for LINQ to SQL class is DataClasses.dbml

LINQ to SQL Class in asp.net

Step-4 : Click Add

The object Relational Designer window opens. In this window, you can drag and drop the table from the server Explorer. The action will add the table to your application, and you can retrieve any data from the table. In this case, the products table from the database is added to the object Relational Designer window, 
After you have added the table to the my.dbml file, you can find the code for the .aspx in the listing

Add database table into dbml file

Source code
<form id="form1" runat="server">
    <div>
        <asp:ListBox ID="ListBox1" runat="server" Height="97px" Width="98px"></asp:ListBox> 
    </div>
    </form>
Code Behind Code
protected void Page_Load(object sender, EventArgs e)
    {
        myDataContext dc = new myDataContext();
        var query = dc.usertables;
        foreach (usertable  item in query)
        {
            ListBox1.Items.Add(item.id.ToString() + " " + item.name);
        }
    }

Code generate the following output

How to use LINQ to SQL in ASP.NET
If your .dbml name is my then your DataContext name is myDataContext. After adding the table into dbml file , your table name look in the dbml file. 

Comments

Popular Post

Polynomial representation using Linked List for Data Structure in 'C'

Polynomial representation using Linked List The linked list can be used to represent a polynomial of any degree. Simply the information field is changed according to the number of variables used in the polynomial. If a single variable is used in the polynomial the information field of the node contains two parts: one for coefficient of variable and the other for degree of variable. Let us consider an example to represent a polynomial using linked list as follows: Polynomial:      3x 3 -4x 2 +2x-9 Linked List: In the above linked list, the external pointer ‘ROOT’ point to the first node of the linked list. The first node of the linked list contains the information about the variable with the highest degree. The first node points to the next node with next lowest degree of the variable. Representation of a polynomial using the linked list is beneficial when the operations on the polynomial like addition and subtractions are performed. The resulting polynomial can also

How to use Tabs in ASP.NET CORE

I want to show Components in a tabs , so first of all create few components. In this project we have three components, First View Component  public class AllViewComponent : ViewComponent     {         private readonly UserManager<ApplicationUser> _userManager;         public AllViewComponent(UserManager<ApplicationUser> userManager)         {             _userManager = userManager;         }         public async Task<IViewComponentResult> InvokeAsync()         {             List<StudentViewModel> allUsers = new List<StudentViewModel>();             var items = await _userManager.Users.ToListAsync();             foreach (var item in items)             {                 allUsers.Add(new StudentViewModel {Id=item.Id, EnrollmentNo = item.EnrollmentNo, FatherName = item.FatherName, Name = item.Name, Age = item.Age, Birthdate = item.Birthdate, Address = item.Address, Gender = item.Gender, Email = item.Email });             }            

Memory representation of Linked List Data Structures in C Language

                                 Memory representation of Linked List              In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.                Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:       Suppose next node is allocated at an address 506, so the list becomes,   Suppose next node is allocated with an address with an address 10,s the list become, The other way to represent the linked list is as shown below:  In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of