MissionPlanner.GridUI.LoadGrid C# (CSharp) Method

        public void LoadGrid()
        {
            System.Xml.Serialization.XmlSerializer reader = new System.Xml.Serialization.XmlSerializer(typeof(GridData));

            using (OpenFileDialog ofd = new OpenFileDialog())
            {
                ofd.Filter = "*.grid|*.grid";
                ofd.ShowDialog();

                if (File.Exists(ofd.FileName))
                {
                    using (StreamReader sr = new StreamReader(ofd.FileName))
                    {
                        var test = (GridData)reader.Deserialize(sr);

                        loading = true;
                        loadgriddata(test);
                        loading = false;
                    }
                }
            }
        }

        void but_Click(object sender, EventArgs e)
        {
            using (var gridui = new GridUI(this))
            {
                MissionPlanner.Utilities.ThemeManager.ApplyThemeTo(gridui);

                if (Host.FPDrawnPolygon != null && Host.FPDrawnPolygon.Points.Count > 2)
                {
                    gridui.ShowDialog();
                }
                else
                {
                    if (
                        CustomMessageBox.Show("No polygon defined. Load a file?", "Load File", MessageBoxButtons.YesNo) ==
                        DialogResult.Yes)
                    {
                        gridui.LoadGrid();
                        gridui.ShowDialog();
                    }
                    else
                    {
                        CustomMessageBox.Show("Please define a polygon.", "Error");
                    }
                }
            }
        }