Epilog o.O

The class

public ref class Solution
{
	String ^ Name;
	String ^ File;
	String ^ Folder;

	public: DateTime DateCreated;
	public: DateTime DateModified;

	public: String ^ Description;

	static System::Collections::Generic::List<Project^>^ Projects = gcnew System::Collections::Generic::List<Project^>();

public:
	Solution(String^_Name,String^_File,String ^ _Folder,String ^ _Description)
	{
		Name = _Name;
		File = _File;
		Folder = _Folder;
		Description = _Description;

		DateCreated = DateTime::Now;
		DateModified = DateTime::Now;
		if(!Directory::Exists(Folder))
		{
			Directory::CreateDirectory(Folder);
		}
		SaveSolution();
	}
	void AddProject(Project ^ prj)
	{
		Projects->Add(prj);
	}
	void RemoveProject(Project ^ prj)
	{
		Projects->Remove(prj);
	}
	void SaveSolution()
	{
		XmlTextWriter ^SolutionXMLWriter = gcnew XmlTextWriter(Folder + "\\" + File + ".sln", Encoding::UTF8);		
		SolutionXMLWriter->WriteStartDocument();

			//Solution Info
			/*SolutionXMLWriter->WriteStartElement(L"Solution Version");
					SolutionXMLWriter->WriteValue(SOLUTION_VERSION);	
			SolutionXMLWriter->WriteEndElement();*/
			//Projects
			SolutionXMLWriter->WriteStartElement(L"Solution Info");
				SolutionXMLWriter->WriteElementString(L"CreationDate",DateCreated.ToString("dd::mm::yyyy-hh::mm::ss"));
				SolutionXMLWriter->WriteElementString(L"ModifiedDate",DateModified.ToString("dd::mm::yyyy-hh::mm::ss"));
				SolutionXMLWriter->WriteElementString(L"Description",Description);
				SolutionXMLWriter->WriteElementString(L"Folder",Folder);
				SolutionXMLWriter->WriteElementString(L"File",File);
			SolutionXMLWriter->WriteEndElement();
			SolutionXMLWriter->WriteStartElement(L"Projects");
				for each(Project^ prj in Projects )
				{
					SolutionXMLWriter->WriteStartElement(L"Project");
						SolutionXMLWriter->WriteElementString(L"File",prj->GetPath());
						SolutionXMLWriter->WriteElementString(L"Description",prj->Description);
							SolutionXMLWriter->WriteStartElement(L"Open");
								SolutionXMLWriter->WriteValue(prj->Open);
							SolutionXMLWriter->WriteEndElement();
							SolutionXMLWriter->WriteStartElement(L"Export");
								SolutionXMLWriter->WriteValue(prj->IsExportAble);
							SolutionXMLWriter->WriteEndElement();
					SolutionXMLWriter->WriteEndElement();
				}
			SolutionXMLWriter->WriteEndElement();

		SolutionXMLWriter->WriteEndDocument();
		SolutionXMLWriter->Flush();
		SolutionXMLWriter->Close();
	}
};

Error Line showed by VS10

Solution ^ temp = gcnew Solution(Textbox_Name->Text,Textbox_Name->Text,ComboBox_Location->Text,"");	

The error

An unhandled exception of type 'System.InvalidOperationException' occurred in System.Xml.dll

Additional information: Token StartElement in state Epilog would result in an invalid XML document.

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The first 2 words written by beginners "Hello, World". #include<brain.h> :)