How to find the id of dragged control.

You can iterate the controls in the form.

List text_controls = new List();

FindAllControls(this.Controls, text_controls);

private void FindAllControls(Control.ControlCollection controls, List ctrlsWithTextProperty)

{

foreach(Control ctrl in controls)

{

if(ctrl.GetType().GetProperty("Text") != null)

{

ctrlsWithTextProperty.Add(ctrl);

}

if (ctrl.Controls != null)

{

FindAllControls(ctrl.Controls, ctrlsWithTextProperty);

}

}

This property will give the total controls in the form.

control.Controls.Count