ReflectionTypeLoadException in Simple.Data using PostgreSql - asp.net

Question

I am trying to open PostgreSQL connection but getting ReflectionTypeLoadException while opening connection.
Please help me out to solve this problem by providing code or let me know how to remove this exception.
Code i am using so far is below:
**/* Connection String
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="superuserDatabase" value="postgres"/>
</appSettings>
<system.data>
<DbProviderFactories>
<clear/>
<add name="Npgsql Data Provider"
invariant="Npgsql"
description=".Net Framework Data Provider for Postgresql Server"
type="Npgsql.NpgsqlFactory, Npgsql" />
</DbProviderFactories>
</system.data>
<connectionStrings>
<add name="Simple.Data.Properties.Settings.DefaultConnectionString"
connectionString="host=localhost;port=5432;database=SimpleData;user id=postgres;password=P#ssw0rdsa;pooling=false"
providerName="Npgsql" />
<add name="Test"
connectionString="host=localhost;port=5432;database=SimpleData;user id=postgres;password=P#ssw0rdsa;pooling=false"
providerName="Npgsql" />
</connectionStrings>
</configuration>**
*/
I am getting following exception when trying to open connection in POSTGRESQL
var namedDb = Database.OpenNamedConnection("Test").Demo.All();
ReflectionTypeLoadException

Answer 1

This ReflectionLoadTypeException is most often caused because the DLLs you're using aren't up to date so the dependency chain fails. Use nuget to update your project with the latest DLLs. v0.16.2.2 of the PostgreSql provider requires
Simple.Data.Core (≥ 0.12.2.2)
Simple.Data.Ado (≥ 0.12.2.2)
Npgsql (≥ 2.0.11)
(via Mark Rendle) Try explicitly installing 0.16.2.2 of Simple.Data.Ado first, then installing the Postgres package.