"Instance failure."error when connectionstring open

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HTML

<configuration>
  <!--<configSections>
  </configSections>-->
  <connectionStrings>
    <add name="ConnectionName" providerName="System.Data.SqlClient" connectionString="Data Source=MyServerName;Initial Catalog=MyDatabaceName;Integrated Security=True"  />
  </connectionStrings>
</configuration>

C#

SqlConnection Sqlc = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionName"].ConnectionString);

and a function to open connection:

C#

OpenConnection(Sqlc);

public bool OpenConnection(SqlConnection con)
{
  if (Sqlc.State == System.Data.ConnectionState.Closed)
      Sqlc.Open();                                 //error is here:' Instance failure'
 return true;
}

Posted 15-Feb-14 20:00pm

mit62

Updated 15-Feb-14 20:32pm

v2

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2 solutions

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Abhishek Kumar Goswami · Answer 1 · 2014-02-15T20:05:00

Solution 1

check whether space is there in between initial and catalog catalog

if still problem persists, use like following

<add name="conn" connectionstring="Server=.;Database=myDb;Trusted_Connection=True;" providername="System.Data.SqlClient" />

Posted 15-Feb-14 20:05pm

Abhishek Kumar Goswami

Updated 15-Feb-14 20:07pm

v3

Comments

mit62 16-Feb-14 2:41am

well my databas is not on local server "Server=.".

plus,application run without error when I set this connection string inside my program.

public SqlConnection Sqlc = new SqlConnection("Data Source=MyServerName;
Initial Catalog=myDataBase;Integrated Security=True");

Abhishek Kumar Goswami · Answer 2 · 2014-02-15T23:52:00

Solution 2

change the server name

<add name="conn" connectionstring="Server=MyServerName;Database=myDataBase;Integrated Security=true;" providername="System.Data.SqlClient"/>

Posted 15-Feb-14 23:52pm

Abhishek Kumar Goswami

Updated 15-Feb-14 23:53pm

v2

Comments

mit62 16-Feb-14 9:36am

it doesn't work

Abhishek Kumar Goswami 16-Feb-14 9:38am

can u share error msg

mit62 16-Feb-14 12:53pm

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 that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

Abhishek Kumar Goswami 16-Feb-14 13:24pm

check this thread i think this will surely help you

http://www.codeproject.com/Questions/335874/A-network-related-or-instance-specific-error-occur