Entities' does not contain a constructor that takes 1 arguments

Question

public class Connection
{
    public static string GetConecction()
    {
        return ConfigurationManager.ConnectionStrings[\"DCAssetEntities\"].ConnectionString;
            


        

Answer 1

Make the constructor yourself in a partial class:

public partial class DCAssetEntities: DbContext
{
    public DCAssetEntities(string connectionstring)
        : base(connectionstring)
    {
    }
}

Related question: Entity Connection String Constructor not found in EF 5 and WCF 4.5 at runtime

Answer 2

Your class DCAssetEntities needs to have a constructor with the following definition.

public DCAssetEntities(string connectionString){}

Answer 3

You need to mark the constructor as public (or internal).