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SqlConnection string


By : Sebastian Thormann
Date : September 29 2020, 07:00 AM
wish helps you Environment.GetCommandLineArgs()[0] is the full path of your executable, thus:
code :
string appPath = Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]);
string connStr = $@"Data Source=(LocalDB)\v11.0;AttachDbFilename={appPath}\BazaDate.mdf;Integrated Security=True;";

var conn = new SqlConnection(connStr);
conn.Open();


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What does this code do: using (SqlConnection cn = new SqlConnection(connectionString))


By : Xaon
Date : March 29 2020, 07:55 AM
it fixes the issue What does
code :
new SqlConnection(connectionString)
SqlConnection cn = ...
using(...)
{ // this { } scope is to limit the "cn"
    SqlConnection cn = new SqlConnection(connectionString);
    try { // the body of the using block
        ...
    } finally { // dispose if not null
        if(cn != null) { cn.Dispose(); }
    }
}

Creating a transaction scope with new SqlConnection within existing SqlConnection using block


By : George B
Date : March 29 2020, 07:55 AM
should help you out
Due to connection pooling, the same connection will be used for both SELECT and UPDATE queries
code :
using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();

    // execute a single SELECT here
} // <==== end the first connection

using (TransactionScope scope = new TransactionScope())
{
    for (int i=0; i<...; i++)
    {
        Update(); // UPDATE query
    }

    scope.Complete();
}
using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();

    // execute a single SELECT here
} // <==== end the first connection

using (TransactionScope scope = new TransactionScope())
using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();
    for (int i=0; i<...; i++)
    {
        Update(connection); // UPDATE query
    }

    scope.Complete();
}

End Using SqlConnection Kills my global sqlConnection connection string


By : user7196028
Date : March 29 2020, 07:55 AM
should help you out Since SqlConnection is a reference type, when you assign conn in the using statement the actual global connection is used and not a copy.
When the using scope ends Disposed is called on the global connection and it becomes useless. You should not use a global connection like this for thread safety issues (among others).
code :
Public Class ReqGlobal
   private shared _cnnStr As string = "someConnectionString"

   Public Shared Function GetConnection() As DbConnection
      Dim con = new SqlClient.SqlConnection(_cnnStr)
      con.Open()
      return con
   End Function

End Class
Using conn As DbConnection = ReqGlobal.GetConnection()
...
End Using

Connection string. Cannot implicitly convert 'String' to 'System.Data.SqlClient.SqlConnection'


By : user2554808
Date : March 29 2020, 07:55 AM
wish of those help Try this way. First get the connection string from web.conf or app.conf and then create a sqlconnection to assign to sqlcommand.
code :
 var connectionString =  
     ConfigurationManager.ConnectionStrings["NameofConstringFromWebconfig"].ConnectionString;
 SqlCommand cmd = new SqlCommand();
 cmd.Connection =new SqlConnection(connectionString);

System.Data.SqlClient.SqlConnection: Open and Close SqlConnection with methods, Read and Write in Main method


By : user3342608
Date : March 29 2020, 07:55 AM
To fix this issue You have the connection object creation in a using block. The using block will close the connection when you exit its scope because the SqlConnection implements IDisposable.
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