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With SDAC 7 beta (XE7) when i try to connect to SQL Server with
MSConnection.Options.Provider=prDirect
displays error message [Wrong provider name]

When set the MSConnection.Options.Provider to prAuto is connected.

What are the differences between prDirect and prNativeClient ?

Hello,

Thank you for the information, we have reproduced the problem and will investigate the reasons for such behavior.

The prDirect option enables the "Direct" mode, in which there is no need to install additional client libraries - you can work with the database directly via TCP/IP. prNativeClient means that you will work with the database using Microsoft SQL Server Native Client.