'SAP- Connect to SAP from using .net connectors - proxies connect to the SAP

hello trying to connect using ASP.net web application to SAP.

Below error occurred.

What DLL should be included?

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Solution 1:[1]

libs

all dll were installed , and the related reference

Solution 2:[2]

is there any additional library DLL to fix the below enter image description here

Sources

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Source: Stack Overflow

Solution Source
Solution 1 simon
Solution 2 simon