oracle connection string with SID in c# -

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Hi, I have to connect to an ORCL database (which I know little about) using a Windows application. Applications of windows will not necessarily be in the same system. I just needed the connection string so I used the Connectivity functionality in Visual Studio 2014 to test the connection and to get the string. EDB is the SI which I have read

Enter image details here < P> Now, using the above, I was able to connect to the database using this functionality and even in my Visual Studio Server Explorer all the tables of the Oracle database were being shown but I had connections in the windows application There was a need to use the string. So I used the following string: 

  data source = 172.31.8.21: 1521 / edb; USER ID = PDB_E_GND_R   
 I also added the password for this string  
  data source = 172.31.8.21: 1521 / EEDB; USER ID = PDB_E_GND_R; PASSWORD = 123   
 I get an error when I run the application.  
  System.Data.OracleClient.OracleException: ORA-01017: Invalid Username / Password; logon denied.   
 So: Why am I getting this error? Now some people can mark this question as a duplicate and even a reply can be found on this issue too.  
 Coz If this is the case, then I would not be able to establish connection based on the functionality of the Joint Connection of Visual Studio. Please note: I added context: Oracle.DataAccess  
 And for a programmer like me, who has very little knowledge about Oracle, how can I find out that I have a special Oracle DB To use which connection string is to use.   
 
 
 The following connection string EZ connect does not appear so ez  
 data source = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = 172.31.8.21) (port = 1521))) (KNECTATA = (SERVICE_NAME = eedb))); USER ID = PDB_E_GND_R; PASSWORD = 123

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