Mohammad Daoud explains how he solved the eConnect Error: The argument type SqlClient cannot be converted into parameter type Microsoft.Dynamics.GP.eConnect.EnumTypes+ConnectionStringType.
Mohammad R. Daoud: eConnect Error: The argument type `SqlClient` cannot be converted into parameter type `Microsoft.Dynamics.GP.eConnect.EnumTypes+ConnectionStringType`.
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Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.