Tuesday, September 8, 2009

Accessing SQL Azure Using ADO.NET

In my first post on SQL Azure (SQL Azure: A First Contact) I talked about how you can access SQL Azure using SQL Server 2008 Management Studio (SSMS).

In this post, the journey continues with “walking” on the cloud using ADO .NET :)

Here’s the recipe!

  • A valid SQL Azure CTP account
  • Visual Studio 2008 SP1
  • .NET Framework 3.5 SP1
  • C# (or respective VB.NET) namespace: System.Data.SqlClient
Objects used from System.Data.SqlClient namespace:
  • SqlConnection
  • SqlCommand
  • SqlDataReader
  • SqlDataAdapter
  • Step 1: Add namespace for using SqlClient
  • Step 2: Set up connection to database
  • Step 3: Open database connection
  • Step 4: Set the T-SQL command(s) - Use the "SqlCommand" object
  • Step 5: Open the SqlDataReader - Execute the T-SQL command(s)
  • Step 6: Display the results (if any)
  • Step 7: Close the SqlDataReader
  • Step 8: Close the database connection
Source Code (for obvious reasons I removed the connection string from the source code file)
  • You can find the sample source code for this post here.
  • *Note: This sample code is for demo purposes and does not represent production code.
  • My example is based on the example in my previous post on SQL Azure (Database Name: sqlazure, table name: CLOUD_MSGS)
  • For this post I used a new Visual C# “Console Application” project named ADO .NET – SQL Azure like in the following screenshot:

Screenshot of the output

Have fun!

Drop me a comment if you need any help implementing the ADO.NET connection to SQL Azure!
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Artemakis Artemiou [MVP]

Author & Editor

Artemakis Artemiou is a Senior SQL Server Architect, Software Developer and Microsoft Data Platform MVP. He is also an author, regular blogger, president of Cyprus.NET User Group and CY Country leader of INETA-EU. He is also the creator of DBA Security Advisor and In-Memory OLTP Simulator. Artemakis is a frequent guest author of worldwide well-respected online journals where he writes articles focusing on many SQL Server topics.

Reference: The SQL Server and .NET Hub (http://www.sqlnethub.com)


Bablu Singh said...

I am not able to connect to SQL Azure.

Here is what my code is:

using (SqlConnection conn = new SqlConnection("Server=ufh1cinawq.database.windows.net;Database=MASTER;User ID=vksingh24;Password=xxx;Trusted_Connection=False"))
using (SqlCommand command = conn.CreateCommand())

// Create a table
command.CommandText = "CREATE TABLE Vikash(Col1 int primary key, Col2 varchar(20))";

// Insert sample records
command.CommandText = "INSERT INTO Vikash(col1, col2) values (1, 'Vikash Kumar Singh'), (2, 'Kumar Saurabh'), (3, 'RockStar')";
int rowsAdded = command.ExecuteNonQuery();

// Query the table and print the results
command.CommandText = "SELECT * FROM Vikash";

using (SqlDataReader reader = command.ExecuteReader())
// Loop over the results
while (reader.Read())


I also check the firewall setting. Please help me to connect to SQL Azure.

Artemakis Artemiou [MVP] said...


You need to properly configure the Firewall settings from within the SQL Azure - Server Administration web page.

To this end you can add a new Firewall rule, give it a name you like, and in the IP range include your public IP (the "Add Firewall Rule" dialog displays your public IP).

Then wait for a few minutes and try again.

I have also noticed that in the connection string you are using the "master" database and then you are trying to create a new table in it. Note that you cannot create a table in the master database as it is a system database. You can create a new database instead and work with it.

Hope this helps!