You can determine the number of objects in a collection using the collection's Count property:

To write code in Visual Basic

' Set a variable equal to the number of Splits in C1List1.     
variable = Me.C1List1.Splits.Count

To write code in C#

// Set a variable equal to the number of Splits in C1List1. 
variable = this.c1List1.Splits.Count;

You can also iterate through all objects in a collection using the Count property as in the following example, which prints the Caption string of each C1DataColumn object in a list:

To write code in Visual Basic

For n = 0 To Me.C1List1.Columns.Count - 1
    Debug.WriteLine(Me.C1List1.Columns(n).Caption)    
Next n

To write code in C#

for (int n = 0; n <= this.c1List1.Columns.Count - 1; n++)      
{     
     Console.WriteLine(this.c1List1.Columns[n].Caption);     
}

The Count property is also useful for appending and removing columns:

To write code in Visual Basic

' Determine how many columns there are.       
Dim NumCols As Integer
NumCols = Me.C1List1.Columns.Count
    
' Append a column to the end of the Columns collection.  
Dim C As New C1List.C1DataColumn()    
Me.C1List1.Columns.Insert(NumCols, C)
    
' The following loop removes all columns from the list.   
While Me.C1List1.Columns.Count 
      Me.C1List1.Columns.RemoveAt(0) 
End While

To write code in C#

// Determine how many columns there are.  
int NumCols;
NumCols = this.c1List1.Columns.Count;
  
// Append a column to the end of the Columns collection.     
C1List.C1DataColumn C = new C1List.C1DataColumn(); 
this.c1List1.Columns.Insert(NumCols, C);

// The following loop removes all columns from the list.    
while (this.c1List1.Columns.Count)   
this.c1List1.Columns.RemoveAt(0);

Visual Basic also provides an efficient For Each...Next statement that you can use to iterate through the objects in a collection without using the Count property:

To write code in Visual Basic

Dim C As C1List.C1DataColumn    
For Each C In Me.C1List1.Columns
     Debug.WriteLine(C.Caption)
Next

To write code in C#

C1List.C1DataColumn C;    
foreach (C in this.c1List1.Columns )    
{   
     Console.WriteLine(C.Caption);     
}

In fact, using the For Each...Next statement is the preferred way to iterate through the objects in a collection.