NumericUpDown List and Button List . How to link them ?

Question

Hello ,

 

I have a List of Buttons and a List of NumericUpDown.

numUpDnList = new List();
btnList = new List();
for (int i = 0; i < maxv; i++)
{
Button btn = new Button();
btn.Location = new Point(121, 275 + i * 19);
this.Controls.Add(btn);
btnList.Add(btn);

NumericUpDown numUpDn = new NumericUpDown();
numUpDn.Location = new System.Drawing.Point(120, 275 + i * 19);
// numUpDn.Size = new System.Drawing.Size(50, 20);
this.Controls.Add(numUpDn);
numUpDnList.Add(numUpDn);
}

I want to: btnList[i].Click += (se, ev) => { numUpDnList[i].UpButton(); }

 

But it doesn't work :

 

" System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection.

Parameter name: index' "