how to map model classes to existing database using code first with existing database

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MVC3

Hi all,

I wrote the following code for mapping model classes to existing database but after creating the controller and executing app am getting exception as "Invalid object name 'dbo.ProductGroups"

web.config:

<connectionStrings>
<add name="DatabaseContext" connectionString="Data Source= ACER-PC; Integrated Security=true;Initial Catalog=Practise; uid=sa; Password=srujana; " providerName="System.Data.SqlClient" />
</connectionStrings>

DatabaseContext Class:

public class DatabaseContext:DbContext
{

public DbSet<Product> Products { get; set; }
public DbSet<ProductGroup> ProductGroups { get; set; }

}

model classes:

public class ProductGroup
{
[Key]
public int ProductGroupID { get; set; }

[Required]
public int ProductGroupName { get; set; }

[Required]
public string Country { get; set; }

[StringLength(255)]
public string CreatedBy { get; set; }

[ScriptIgnore]
public virtual ICollection<Product> Products { get; set; }