system.argumentoutofrangeexception: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index') at System.Collections.Generic.List`1.get_Item(Int32 index) code example

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

'When using a datagridview, ensure that refernaced columns AND rows exist

DataGridView.RowCount = 10
DataGridView.ColumnCount = 10