How to Save Winform to XML file and Open to Load it with Browse button?

If you wish to specify file names, I suggest you use standard WinForms components:
SaveFileDialog
FileDialog
OpenFileDialog

I got confuse with some issue when i try to load with load button.
in the sample, column was created by DataTable, but my program created column by TreeListColumn.
this is my code:
private void CreateColumn(TreeList tl)
{
            tl.BeginUpdate();
            tl.Name = "Table1";
            string[] caption = { "caption1", "caption2", "caption3", "caption4", "caption5", "caption6", "caption7", "caption8", "caption9",
                               "caption10", "caption11", "caption12", "caption13"};
            for (int i = 0; i < 13; i++)
            {
                tl.Columns.Add();
                tl.Columns[i].Caption = caption[i];
                tl.Columns[i].VisibleIndex = i;
                tl.Columns[i].FieldName = caption[i];
                tl.Columns[i].Name = caption[i];
                tl.Columns[i].BestFit();
                tl.ExpandAll();
            }
          tl.EndUpdate();
}
and the sample code:
private static DataTable CreateTable(int RowCount) {
            DataTable tbl = new DataTable();
            tbl.TableName = "Table1";
            tbl.Columns.Add("Name", typeof(string));
            tbl.Columns.Add("ID", typeof(int));
            tbl.Columns.Add("ParentID", typeof(int));
            tbl.Columns.Add("Number", typeof(int));
            tbl.Columns.Add("Date", typeof(DateTime));
            for (int i = 0; i < RowCount; i++) {
                tbl.Rows.Add(new object[] { String.Format("Name{0}", i), i + 1, -1, 3 - i, i,DateTime.Now.AddDays(i) });
            }
            return tbl;
}
the issue is:
private void simpleButton2_Click(object sender, EventArgs e) {
            XElement LayoutElement = XElement.Load("Result.xml");
            string LayoutFileName = "Result.xml";
            FileStream LayoutFile = new System.IO.FileStream(LayoutFileName, System.IO.FileMode.Open);
            treeList1.RestoreLayoutFromStream(LayoutFile, OptionsLayoutBase.FullLayout);
            LayoutFile.Close();
            MemoryStream DataFile = new System.IO.MemoryStream();
            LayoutElement.Element("DataSet").Elements().First().Save(DataFile);
            DataFile.Seek(0, SeekOrigin.Begin);
            ds.Clear();
            ds.ReadXml(DataFile);
            treeList1.DataSource = ds.Tables["Table1"]; //this is the issue, cause I made column with TreeListColumn, no DataTable
            int foo = ds.Tables["Table1"].Rows.Count; //this is the issue
}
thank you.

The sample project in the How to Save and Open Layout to XML? topic illustrates how to add xml data as a separate node to other xml data. If you do not need to save TreeList data, you can exclude the code where the DataSet is saved. TreeList saves columns in its layout data, thus, there is no need to save and load them separately.