External Paramaters- Webparts- Sharepoint

I am trying to pass some parameters to the webpart using the following code. I am providing some default value to the same but there are not being reflected. Could anybody point me what is been missing.

 [System.Web.UI.WebControls.WebParts.WebBrowsable(true),
    System.Web.UI.WebControls.WebParts.WebDisplayNameAttribute("Databse Name"),
    System.Web.UI.WebControls.WebParts.WebDescriptionAttribute("Databse Name"),
    System.Web.UI.WebControls.WebParts.Personalizable(
    PersonalizationScope.Shared, true),
    System.ComponentModel.DefaultValue("DatabaseNameDefaultValue"),
    System开发者_如何学JAVA.ComponentModel.CategoryAttribute("Webpart Parameters")
   ]
    public string Database
    {
        get
        {
            return _Database;
        }
        set
        {
            _Database = value;
        }
    }

I cannot see the default value not being assigned.

Thank you.

Hari Gillala

---

It will only apply the default on brand new instances of the webpart.

And also only if the value isn't in a .webpart file that you're importing.