How to customize PDF document name from.NET MVC PDF Viewer?

// Caption labels
for(int i = 0; i < this.CaptionLabels.Count; i++)
{
  CaptionLabel item = this.CaptionLabels[i];
  item.LabelMouseEnter += new CaptionLabel.MouseEnter(item_LabelMouseEnter);
  item.LabelMouseLeave += new CaptionLabel.MouseLeave(item_LabelMouseLeave);
  item.LabelMouseDown += new CaptionLabel.MouseDown(item_LabelMouseDown);
}
/// <summary>
/// Occurs on Mouse Pointer Leave
/// </summary>
void item_LabelMouseLeave(object sender, LabelMouseLeaveEventArgs e)
{
  if((sender as CaptionLabel) != null)
  {
    (sender as CaptionLabel).ForeColor = Color.White;
  }
}
/// <summary>
/// Occurs on Mouse Pointer Enter
/// </summary>
void item_LabelMouseEnter(object sender, LabelMouseEnterEventArgs e)
{
  if((sender as CaptionLabel) != null)
  {
    (sender as CaptionLabel).ForeColor = Color.Yellow;
  }
}

' Caption labels
For i As Integer = 0 To Me.CaptionLabels.Count - 1
  Dim item As CaptionLabel = Me.CaptionLabels(i)
  AddHandler item.LabelMouseEnter, AddressOf item_LabelMouseEnter
  AddHandler item.LabelMouseLeave, AddressOf item_LabelMouseLeave
  AddHandler item.LabelMouseDown, AddressOf item_LabelMouseDown
Next i
''' <summary>
''' Occurs on Mouse Pointer Leave
''' </summary>
Private Sub item_LabelMouseLeave(ByVal sender As Object, ByVal e As LabelMouseLeaveEventArgs)
  If(TryCast(sender, CaptionLabel)) IsNot Nothing Then
    TryCast(sender, CaptionLabel).ForeColor = Color.White
  End If
End Sub
''' <summary>
''' Occurs on Mouse Pointer Enter
''' </summary>
Private Sub item_LabelMouseEnter(ByVal sender As Object, ByVal e As LabelMouseEnterEventArgs)
  If(TryCast(sender, CaptionLabel)) IsNot Nothing Then
    TryCast(sender, CaptionLabel).ForeColor = Color.Yellow
  End If
End Sub