progressbar1.value=control.location.x/y

'Using The Click or MouseDown or any Mouse Event

Dim Value As Integer= Me.PointToClient(MousePosition).X-Progressbar.Bounds.X

Progressbar.value= Value

private void progressBar1_Click(object sender, EventArgs e)
        {
            // Get mouse position(x) minus the width of the progressbar (so beginning of the progressbar is mousepos = 0 //
            float absoluteMouse = (PointToClient(MousePosition).X - progressBar1.Bounds.X);
            // Calculate the factor for converting the position (progbarWidth/100) //
            float calcFactor = progressBar1.Width / (float)100;
            // In the end convert the absolute mouse value to a relative mouse value by dividing the absolute mouse by the calcfactor //
            float relativeMouse = absoluteMouse / calcFactor;

            // Set the calculated relative value to the progressbar //
            progressBar1.Value = Convert.ToInt32(relativeMouse);
        }