BizTalk Complex Type not serializing in Orchestration

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biztalk

Hi
I am facing an issue while constructing a message of defined typed schema. The root node of the schema is of complex type. Say Node name is "MessageRequest", but the type is complex and is named as "MessageInput". I have generated the class for this schema and looks similar to the below code:

[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.42")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(Namespace = "namespace")]
    [System.Xml.Serialization.XmlRootAttribute("MessageRequest", Namespace = "namespace", IsNullable = false)]
    public partial class MessageInput
    {
      //content
    }

Now in BizTalk construct message shape, i try to create the message of same schema type, it is throwing invalid cast exception Says "Cannot implicitly convert from class type to schema type.

msg_Input = Namespace.GenerateToInput();

Thanks in advance for your help.

Regards
Jinu