LINQ to SQL Inner Join

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  Keywords : Linq to sql inner join with multiple tables example in c# / vb.net, How to use linq to sql inner join in c# / vb.net with example, Linq sql inner join with multiple conditions example

Here we will learn LINQ to SQL inner join in c#, vb.net with example and how to use LINQ to SQL inner join with multiple tables or conditions to get required data in c#, vb.net with examples.

LINQ to SQL Inner Join

In LINQ to SQL inner join will return only the records or rows that match in both the tables based on defined conditions.

Syntax of LINQ to SQL Inner Join

Following is the syntax of using LINQ to SQL Inner Join to get data from multiple tables.

 

C# Code

 

var result = from ed in db.EmployeeDetails

join d in db.Departments on ed.DeptId equals d.DeptId

select new

{

Name = ed.EmpName,

Department = d.DeptName

};

VB.NET Code

 

Dim result = From ed In db.EmployeeDetails Join d In db.Departments On ed.DeptId Equals d.DeptId

Select New With {.Name = ed.EmpName, .Department = d.DeptName}

If you observe above syntax we joined “EmployeeDetails”, “Departments” tables to get required data by using inner joins.

Example of LINQ to SQL Inner Join

Before we start implement LINQ to SQL inner join example first we need to create a database with required tables and map those tables to LINQ to SQL file (.dbml) if you don't know the process don't worry check this link create and map database tables to LINQ to SQL file (.dbml).

 

Once we create and map required tables to .dbml file now we will show data in our application for that Right click on application → select Add → New Item → Select Web Form → Give name as Default.aspx and click OK button.

 

Now open Default.aspx page and write the code like as shown below

 

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title>Show Employee Details in Gridview</title>

</head>

<body>

<form id="form1" runat="server">

<div>

<asp:GridView ID="gvDetails" runat="server"></asp:GridView>

</div>

</form>

</body>

</html>

Now open code behind file and write the code like as shown below

 

C# Code

 

protected void Page_Load(object sender, EventArgs e)

{

EmployeeDBDataContext db = new EmployeeDBDataContext();

if (!Page.IsPostBack)

{

var result = from ed in db.EmployeeDetails

join d in db.Departments on ed.DeptId equals d.DeptId

where d.DeptName.Equals("software")

select new

{

Name = ed.EmpName,

Location = ed.Location,

Gender = ed.Gender,

Department = d.DeptName

};

gvDetails.DataSource = result;

gvDetails.DataBind();

}

}

VB.NET Code

 

Public Class WebForm1

Inherits System.Web.UI.Page

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

Dim db As New EmployeeDBDataContext()

If Not Page.IsPostBack Then

Dim result = From ed In db.EmployeeDetails Join d In db.Departments On ed.DeptId Equals d.DeptId Where d.DeptName.Equals("software")

Select New With {.Name = ed.EmpName, .Location = ed.Location, .Gender = ed.Gender, .Department = d.DeptName}

gvDetails.DataSource = result

gvDetails.DataBind()

End If

End Sub

End Class

If you observe above example, we are trying to get data from “EmployeeDetails” and “Departments” table using inner join.

Output of LINQ to SQL Inner Join

Following is the result of LINQ to SQL inner join example.

 

LINQ to SQL Inner Join Query with Example

 

This is how we can use LINQ to SQL inner join with multiple tables in c#, vb.net to get required data from multiple tables based on our requirements 

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