How to load intellisense function from XML in WinForms SyntaxEditor (EditControl)?

private void editControl1_ContextChoiceOpen(Syncfusion.Windows.Forms.Edit.Interfaces.IContextChoiceController controller)
{
   reader = new XmlTextReader(intellisensePath);
   while (reader.Read())
   {
      string itemname = "", tooltip = "", category = "";
      switch (reader.NodeType)
      {
         case (XmlNodeType.Element):
                 if (reader.Name == "Items")
                 {
                    if (reader.AttributeCount > 0)
                    {
                       while (reader.MoveToNextAttribute())
                       {
                          if (reader.Name == "Name")
                          {
                             itemname = reader.Value;
                          }
                          if (reader.Name == "Tooltip")
                          {
                             tooltip = reader.Value;
                          }
                          if (reader.Name == "Category")
                          {
                            category = reader.Value;
                          }
                          if (reader.Name == "Image")
                          {
                             if (category.ToLower() == "class" && isParentClass)
                                controller.Items.Add(itemname, tooltip,  this.editControl1.ContextChoiceController.Images[0]);
                             if (category.ToLower() == "method" && (isParentClass || isChildClass || isMethod))
                                controller.Items.Add(itemname, tooltip, this.editControl1.ContextChoiceController.Images[1]);
                             if (category.ToLower() == "cmethod" && (isMethod || isCMethod))
                                controller.Items.Add(itemname, tooltip, this.editControl1.ContextChoiceController.Images[1]);
                             if (category.ToLower() == "property" && (isParentClass || isChildClass))
                                controller.Items.Add(itemname, tooltip, this.editControl1.ContextChoiceController.Images[2]);
                          }
                     }
                 }
             }
             break;
        }
    }
}

Private Sub GetFunctionNames(ByVal e As ContextPromptUpdateEventArgs)
    reader = New XmlTextReader(intellisensePath)
[function] = ""
    Dim i As Integer = 1
    Do While reader.Read()
    [function] = ""
    Select Case reader.NodeType
    Case (XmlNodeType.Element)
             If reader.Name = "Function" Then
                reader.MoveToFirstAttribute()
             If reader.Value = Me.contextPromptLexem Then
                Do While reader.MoveToNextAttribute()
                     If reader.Name = "overloads" & i Then
                        [function] = reader.Value
                     ElseIf reader.Name = "Description" & i Then
                             e.AddPrompt([function], reader.Value)
                             i += 1
                     End If
               End If
               Loop
          End If
       End If
    End Select
    Loop
End Sub