How do I sort a list within another list in vb.net

You simply need to create a class. We can also harness one of .Net's built-in datastructures, the SortedList. In order to use the sorted list, your class needs to implement iComparable, which I will cover below.

Class Product
  public Item as string
  public Descrip as string
  public Price as decimal
  public Bin as string
end class

Now, your class needs to implement iComparable

We'll modify the class as follows

Class Product
  Implements IComparable

  public Item as string
  public Descrip as string
  public Price as decimal
  public Bin as string

  Public Overloads Function CompareTo(ByVal obj As Object) As Integer

    if obj is nothing then return 1

    Dim otherObj As Product = TryCast(obj, Product)
       If otherObj  IsNot Nothing Then 
           if me.bin < otherObj.bin then
             return -1
           else if me.bin = otherObj.bin andalso me.item < otherObj.item then
             return -1
           elseif me.bin = otherObj.bin andalso me.item = otherObj.item then
             return 0
           else
             return 1
       Else 
          Throw New ArgumentException("Object is not a Product")
       End If  
  End Function  

end class

Now, you should use a SortedList(of Product)

You add elements to it like this

Dim MyProduct as NewProduct
MyProduct.bin = "test"
MyProduct.price = 12.0D
MyProduct.item = "test"
MyProduct.descrip = "test"

Dim MySortedList = new SortedList(of Product)
MySortedList.add(NewProduct)

MySortedList always keeps its elements in order.

The code above can be optimized some, but I think you get the picture.

References

• iComparable
• SortedList