Get all projects in the solution with C#

getProjects.cs

public static List<string> GetSolutionList()
{
    List<string> prj = new List<string>();
    // "VisualStudio.DTE.11.0"
    // this represents your visual studio version
    // 11.0 means vs2012
    // 10.0 means vs2010
    // 9.0 means vs2005
    for (int i = 1; i < ((EnvDTE.DTE)System.Runtime.InteropServices.Marshal.GetActiveObject("VisualStudio.DTE.11.0")).Solution.Projects.Count + 1; i++)
    {
        prj.Add(((EnvDTE.DTE)System.Runtime.InteropServices.Marshal.GetActiveObject("VisualStudio.DTE.11.0")).Solution.Projects.Item(i).Name);
    }

    return prj;
}