What Does the 'Connect Timeout' Parameter in a SQL Server Connection String Actually Do?

Unveiling the Enigma of "Connect Timeout" in SQL Server Connection Strings

In the realm of database connectivity, the "Connect Timeout" parameter plays a crucial role. As we inspect a connection string retrieved from a SQL Server property, we encounter the following string:

Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\myUser\Desktop\adoBanche\Banche\bin\Debug\banche.mdf;Integrated Security=True;Connect Timeout=30

The "Connect Timeout" parameter, as its name suggests, dictates the duration for which the connection process can persist before timing out. This timeout is distinct from command timeouts for operations executed after connection establishment.

Diving into the technicalities, this timeout governs the establishment of the connection, rather than the timeout associated with commands executed over that connection. Refer to resources such as http://www.connectionstrings.com/all-sql-server-connection-string-keywords/ for further exploration of this parameter.

Furthermore, it's noteworthy that setting command timeouts via the connection string is not possible. However, the SqlCommand object offers a "CommandTimeout" property, allowing the specification of a per-command timeout in seconds. Keep in mind that resultset iteration using Read() resets the timeout for each read. Ultimately, the timeout applies to individual network requests and not the entire connection duration.

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