AutomationElement aeTB= aeAllTextBoxes[i]

AutomationElementCollection aeAllTextBoxes = aeForm.FindAll(TreeScope.Children,
          new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Edit));       
        Console.WriteLine(aeAllTextBoxes.Count);
        for (int i = 0; i < aeAllTextBoxes.Count; i++)
        {
            string aeTB;
            aeTB="aeTextBox" + Convert.ToString(i);
            Console.WriteLine(aeTB);
            AutomationElement aeTB= aeAllTextBoxes[i];
                      
        }

AutomationElement (Ссылка на aeTB)= aeAllTextBoxes[i];