Cannot connect to SQL Server in Visual Studio

Question

I installed SQL Server and Visual Studio and tried to do my university project.

I can connect to SQL Server in Management Studio but can not connect in Visual Studio!

• Remote connecting is enabled
• all services are running
• and everything is ok but I dont know why I get this error :

A network related or instance specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible.verify that the instance name is correct and the ...

What's wrong with this code?

 SqlConnection sqcon = new SqlConnection("Data Source=.;Initial Catalog=Badan_Sazi;Integrated Security=True");

 SqlCommand com = new SqlCommand();
 com.Connection = sqcon;
 com.CommandText = "SELECT tbl_morabi.family   as 'lname'  FROM tbl_morabi";

 com.Connection.Open();

I also tried . , localhost , my pc name ... same error anyway

• Visual Sudio 2012
• SQL Server Express 2012

Answer 1

SQL Server Express defaults to a SQLEXPRESS instance name

So try to use .\SQLEXPRESS or (local)\SQLEXPRESS as your server+instance name.

And if that doesn't work: what server name do you use in Management Studio to connect to your SQL Server instance?? Use that name!

Answer 2

You can check your connectionString. It should be like that below.

<connectionStrings>
<add name="SampleConnectionString" connectionString="Data Source=machinename\instancename;Initial Catalog=AdventureWorks;Integrated Security=SSPI;Min Pool Size=5;Max Pool Size=60;Connect Timeout=30″ providerName="System.Data.SqlClient"/>
</connectionStrings>

Answer 3

兄弟，您在 vs 连接面板中输入表名..尝试使用数据库文件名..