Home > Uncategorized > Connect to an #Oracle #Database from C#

Connect to an #Oracle #Database from C#


Connecting to an Oracle Database in c# is just as easy as MySQL or SQL server, it just requires it’s own library and a different connection string.

First, you need the following Nuget Package

Install-Package Oracle.ManagedDataAccess

Then import it using:

using Oracle.ManagedDataAccess.Client;

Here’s a code example –

public static DataTable PopulateDataTable(string command)
var sqlConnection = @”Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=XE)));user id=system;Password=xyz123″;
var adapter = new OracleDataAdapter(command, sqlConnection) { SelectCommand = { CommandTimeout = 0 } };
var dataSet = new DataSet();
adapter.Fill(dataSet, “sql”);
return dataSet.Tables[“sql”];

Here, the default service is “XE”, the TNS port is 1521, theĀ  username is system, and password is xyx123 – and the oracle server is on the same PC (localhost)

It’s used as follows;

var strSQL = “select * from someTable”;
var dt = PopulateDataTable(strSQL);
foreach(var dr in dt.Rows.Cast<DataRow>())


Categories: Uncategorized
  1. December 18, 2017 at 5:59 pm

    And if you are using AWS RDS, then the connection string will look like this:

    Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=xxxxx.cwqutyyydm8x.eu-west-1.rds.amazonaws.com)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=ORCL)));user id=xxxxx;Password=xxxxxx


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