How do you automatically resize columns in a DataGridView control AND allow the user to resize the columns on that same grid?

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This trick works for me:

grd.DataSource = DT;
    
// Set your desired AutoSize Mode:
grd.Columns[0].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
grd.Columns[1].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
grd.Columns[2].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
    
// Now that DataGridView has calculated it's Widths; we can now store each column Width values.
for (int i = 0; i <= grd.Columns.Count - 1; i++)
{
    // Store Auto Sized Widths:
    int colw = grd.Columns[i].Width;
    
    // Remove AutoSizing:
    grd.Columns[i].AutoSizeMode = DataGridViewAutoSizeColumnMode.None;
    
    // Set Width to calculated AutoSize value:
    grd.Columns[i].Width = colw;
}

In the Code above:
You set the Columns AutoSize Property to whatever AutoSizeMode you need.
Then (Column by Column) you store each column Width value (from AutoSize value);
Disable the AutoSize Property and finally, set the Column Width to the Width value you previously stored.

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