SQL Server C# Connection: A Comprehensive Guide for Dev

Dear Dev, are you struggling with establishing a connection between SQL Server and C# application? If yes, then you have landed on the right page. In this article, we will discuss all the aspects of establishing a connection between SQL Server and C# application. So, let’s get started.

What is SQL Server C# Connection?

Before we start discussing the connection between SQL Server and C#, let’s understand what SQL Server C# Connection is. SQL Server C# Connection is a way to connect C# application with SQL Server database. It enables C# application to perform database operations like insert, update, delete or retrieve data from SQL Server database.

Components of SQL Server C# Connection

There are three main components of SQL Server C# Connection:

Establishing SQL Server C# Connection

There are mainly two ways to establish SQL Server C# Connection:

Using SqlConnection Class

The SqlConnection class is used to establish a connection to a SQL Server database. Here’s an example:

SqlConnection con = new SqlConnection("Server=myServerAddress;Database=myDataBase;User Id=myUsername;Password=myPassword;");

In the above example, we have passed the connection string as a parameter to the constructor of SqlConnection class.

Using App.Config file

You can also store the connection string in App.Config file and retrieve it using ConfigurationManager class. Here’s an example:

<connectionStrings><add name="myConnection" connectionString="Server=myServerAddress;Database=myDataBase;User Id=myUsername;Password=myPassword;" /></connectionStrings>

using System.Configuration;using System.Data.SqlClient;…string connectionString = ConfigurationManager.ConnectionStrings["myConnection"].ConnectionString;SqlConnection con = new SqlConnection(connectionString);

Performing CRUD Operations Using SQL Server C# Connection

Once you have established a connection between SQL Server and C# application, you can perform CRUD (Create, Read, Update, and Delete) operations on SQL Server database. Here’s an example:

using System.Data.SqlClient;…//CreateSqlCommand cmd = new SqlCommand("INSERT INTO myTable VALUES(@field1, @field2)", con);cmd.Parameters.AddWithValue("@field1", "value1");cmd.Parameters.AddWithValue("@field2", "value2");cmd.ExecuteNonQuery();//ReadSqlCommand cmd = new SqlCommand("SELECT * FROM myTable", con);SqlDataReader reader = cmd.ExecuteReader();while (reader.Read()){Console.WriteLine(reader["field1"].ToString() + " " + reader["field2"].ToString());}//UpdateSqlCommand cmd = new SqlCommand("UPDATE myTable SET field1=@field1 WHERE field2=@field2", con);cmd.Parameters.AddWithValue("@field1", "updatedValue1");cmd.Parameters.AddWithValue("@field2", "value2");cmd.ExecuteNonQuery();//DeleteSqlCommand cmd = new SqlCommand("DELETE FROM myTable WHERE field2=@field2", con);cmd.Parameters.AddWithValue("@field2", "value2");cmd.ExecuteNonQuery();

FAQs

Q1. What is Connection Pooling?

Connection Pooling is a mechanism that enables the reuse of established database connections. When a connection is closed, it is not actually removed from the connection pool. Instead, it is placed back into the pool and can be reused by other requests.

Q2. What is the default timeout for SQL Server C# Connection?

The default timeout for SQL Server C# Connection is 30 seconds.

Q3. How to handle exceptions in SQL Server C# Connection?

You can handle exceptions in SQL Server C# Connection using try-catch block. For example:

try{//SQL Server C# Connection code here}catch (Exception ex){Console.WriteLine(ex.Message);}

Conclusion:

SQL Server C# Connection is a crucial aspect of database programming. In this article, we have discussed how to establish a connection between SQL Server and C# application and how to perform CRUD operations using SQL Server C# Connection. We hope that this article has helped you to understand SQL Server C# Connection. If you have any queries, please feel free to ask in the comments section below.