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Editorial Team
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Asked: 2026-05-13T13:49:32+00:00

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The

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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: SQL Network
Interfaces, error: 26 – Error Locating
Server/Instance Specified)

I’ve created a SQL compact database, included it in my application, and can connect to the database fine from other database editors, but within my application im trying

using (SqlConnection con = new SqlConnection(Properties.Settings.Default.DatabaseConnection))
{
    con.Open();
}

the connection string is

Data Source=|DataDirectory|\Database.sdf

I’m stumped, any insight?

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1 Answer

  1. Editorial Team

    You’re using the wrong type of connection object. SqlConnection is for the grown up SQL server, not for SQL Server Compact.

    connectionstrings.com has the connection strings you need. For the connection object itself I believe you need the SqlCeconnection class

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