C# - DataGridView - Drag and Drop Rows Reorder
The DataGridView controls doesn't have enabled drag and drop reordering rows by default. However, here is the code that you use in the future in your projects in order to implement rows reordering with drag and drop.
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In order to make this example to work you need to have a DataGridView control added to your form with a name dataGridView1 and AllowDrop property of the DataGridView set to "true". Also, the necessary events need to be hooked up to the appropriate event handlers.