Unable to find the requested .Net Framework Data Provider. It may not be installed

Question

Hi it is my first time that I publish a project deveolped with entity framework in a remote server. The pages work fine but when I try to access in my reserved area and so, reading a dabatase, I obtain this error

Unable to find the requested .Net Framework Data Provider. It may not be installed.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Unable to find the requested .Net Framework Data Provider. It may not be installed.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: Unable to find the requested .Net Framework Data Provider. It may not be installed.]
System.Data.Common.DbProviderFactories.GetFactory(String providerInvariantName) +1402071
System.Data.EntityClient.EntityConnection.GetFactory(String providerString) +35

[ArgumentException: The specified store provider cannot be found in the configuration, or is not valid.]
System.Data.EntityClient.EntityConnection.GetFactory(String providerString) +62
System.Data.EntityClient.EntityConnection.ChangeConnectionString(String newConnectionString) +263
System.Data.EntityClient.EntityConnection..ctor(String connectionString) +81
System.Data.Objects.ObjectContext.CreateEntityConnection(String connectionString) +42
System.Data.Objects.ObjectContext..ctor(String connectionString, String defaultContainerName) +16
shield_trust.db_shieldtrustEntities..ctor() in D:\trust-company\shield_trust\shield_trust\POCO.Context.cs:23
shield_trust.user_login.check_login() in D:\trust-company\shield_trust\shield_trust\user_login.aspx.cs:65
shield_trust.user_login.entraButton_Click(Object sender, EventArgs e) in D:\trust-company\shield_trust\shield_trust\user_login.aspx.cs:25
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563

I have to copy some dll into my bin folder or modify my web.config?

Answer 1

Try running this to get a list of installed providers, and check yours is there:

// This example assumes a reference to System.Data.Common.
static DataTable GetProviderFactoryClasses()
{
    // Retrieve the installed providers and factories.
    DataTable table = DbProviderFactories.GetFactoryClasses();

    // Display each row and column value.
    foreach (DataRow row in table.Rows)
    {
        foreach (DataColumn column in table.Columns)
        {
            Console.WriteLine(row[column]);
        }
    }
    return table;
}

UPDATE: You need to have the MySQL Provider installed on the target machine, it's called something like "MySQL Connector Net x.x.x" Which you can get from this website

Answer 2

With our applications (ASP.NET, Test, Windows Service), we've had to add the below to our app.config or web.config files (inside the configuration node) to make this work:

<system.data>
        <DbProviderFactories>
            <remove invariant="MySql.Data.MySqlClient" />
            <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.5.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
        </DbProviderFactories>
    </system.data>