to achieve database independence with entity framework

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.NET3.5

.NET

I have dig on the net but unfortunately did not get the proper solution:

In my application, I am supposed to use .Net 3.5 SP1. Application should be Database independent that is why we are using entity framework. I am able to create app for single DB but for multiple DB (Database : Oracle,SQL) when I am passing connection string in EntityConnection, it is giving errors ( Like Password keyword not supported in connection string). when I am using the same connection string for single DB then it is working fine.

Below constructors are there in edmx designer code file.

/// <summary>
        /// Initializes a new unbSQLEntities object using the connection string found in the 'unbSQLEntities' section of the application configuration file.
        /// </summary>
        public unbSQLEntities() : base("name=unbSQLEntities", "unbSQLEntities")
        {
            this.ContextOptions.LazyLoadingEnabled = true;
            OnContextCreated();
        }
    
        /// <summary>
        /// Initialize a new unbSQLEntities object.
        /// </summary>
        public unbSQLEntities(string connectionString) : base(connectionString, "unbSQLEntities")
        {
            this.ContextOptions.LazyLoadingEnabled = true;
            OnContextCreated();
        }
    
        /// <summary>
        /// Initialize a new unbSQLEntities object.
        /// </summary>
        public unbSQLEntities(EntityConnection connection) : base(connection, "unbSQLEntities")
        {
            this.ContextOptions.LazyLoadingEnabled = true;
            OnContextCreated();
        }

Please help me.