Entity framework 6.1.3 Code first many to many relationship

I tried to build a database with entity framework code first. When i run my project its not being able to create a new database at all and corresponding tables which are in many to many relationship. I do not get a clue what went wrong, please guys help me out with it. i am stucked on it for a day already.

Thank you.

below are my codes:

public class Student

{

public int StudentID { get; set; }

public string StudentName { get; set; }

public ICollection Courses { get; set; }

}

public class Course

{

public int CourseID { get; set; }

public string CourseName { get; set; }

public IList Students { get; set; }

}

public class StudentDbContext : DbContext

{

public DbSet Students { get; set; }

public DbSet Courses { get; set; }

}

connectionString="server=.; database=Lenovoedu; integrated security = true"

providerName ="System.Data.SqlClient"/>

I would be grateful.