无法将Visual Studio连接到SQL Server数据库

Question

I use Visual Studio 2017, I connected to my database from Server Explorer:

.

Then I added SQL connection:

var constring = @"Data Source=JSINJARA\SQLEXPRESS,Database=box,Integrated Security=SSPI";
SqlConnection con = new SqlConnection(constring);

But when I try to open connection I get the following exception:

What can be the problem?

Answer 1

Use ; (semicolon) instead of , (comma) in the connection string.

Eg

var constring = @"Data Source=JSINJARA\SQLEXPRESS;Database=box;Integrated Security=SSPI";
SqlConnection con = new SqlConnection(constring);

See the Connection Strings website for many examples.

Answer 2

Better add it to [app/web].config file and get it using ConfigurationManager .
It's should look something like this:

Config file:

<connectionStrings>
    <add name="ConnectionStringName" connectionString="Data Source=<<Server>>;Initial Catalog=<<DBName>>;User=<<User>>;Password=<<Password>>;"/>
</connectionStrings>

C#:

string connectionString = ConfigurationManager.ConnectionStrings["ConnectionStringName"].ConnectionString;
using(SqlConnection con = new SqlConnection(connectionString))
{
    //Your code goes here
}

Answer 3

尝试在连接中设置Integrated Security=True