c1FlexGrid1.CellFactory = New MyCellFactory()

Public Class MyCellFactory
　　Inherits CellFactory
　　Private val As Double
　　Private hitTestcolumn As Integer
　　Private lfBtnStatus As Boolean = False
　　Private currentCellType As CellType
　　Private _grid As C1FlexGrid

　　Public Overrides Sub ApplyCellStyles(grid As C1FlexGrid, cellType As CellType, rng As CellRange, bdr As Border)
　　　　MyBase.ApplyCellStyles(grid, cellType, rng, bdr)
　　　　If _grid Is Nothing Then
　　　　　　_grid = grid
　　　　　　AddHandler _grid.ResizingColumn, AddressOf _grid_ResizingColumn
　　　　　　AddHandler _grid.MouseMove, AddressOf _grid_MouseMove
　　　　　　AddHandler _grid.PreviewMouseLeftButtonDown, AddressOf _grid_PreviewMouseLeftButtonDown
　　　　　　AddHandler _grid.MouseLeftButtonUp, AddressOf _grid_MouseLeftButtonUp
　　　　End If
　　End Sub

　　Private Sub _grid_PreviewMouseLeftButtonDown(sender As Object, e As MouseButtonEventArgs)
　　　　lfBtnStatus = True
　　　　currentCellType = _grid.HitTest(e.GetPosition(_grid)).CellType
　　　　hitTestcolumn = _grid.HitTest(e.GetPosition(_grid)).Column
　　End Sub

　　Private Sub _grid_MouseLeftButtonUp(sender As Object, e As MouseButtonEventArgs)
　　　　lfBtnStatus = False
　　End Sub

　　Private Sub _grid_MouseMove(sender As Object, e As MouseEventArgs)
　　　　If lfBtnStatus Then
　　　　　　val = e.GetPosition(_grid).X
　　　　End If
　　End Sub

　　Private Sub _grid_ResizingColumn(sender As Object, e As CellRangeEventArgs)
　　　　e.Cancel = True

　　　　If e.CellType = CellType.ColumnHeader Then
　　　　　　Dim fnlColumnWidth As Double = val - _grid.Columns(e.Column).Left - _grid.TopLeftCells.Columns(0).ActualWidth

　　　　　　If fnlColumnWidth > _grid.Columns(e.Column).MinWidth Then
　　　　　　　　_grid.Columns(e.Column).Width = New GridLength(fnlColumnWidth)
　　　　　　End If
　　　　ElseIf e.CellType = CellType.TopLeft Then
　　　　　　_grid.TopLeftCells.Columns(0).Width = New GridLength(val)
　　　　End If
　　End Sub
End Class

c1FlexGrid1.CellFactory = new MyCellFactory();

public class MyCellFactory : CellFactory
{
　　double val;
　　int hitTestcolumn;
　　bool lfBtnStatus = false;
　　CellType currentCellType;
　　C1FlexGrid _grid;

　　public override void ApplyCellStyles(C1FlexGrid grid, CellType cellType, CellRange rng, Border bdr)
　　{
　　　　base.ApplyCellStyles(grid, cellType, rng, bdr);
　　　　if (_grid == null)
　　　　{
　　　　　　_grid = grid;
　　　　　　_grid.ResizingColumn += new EventHandler(_grid_ResizingColumn);
　　　　　　_grid.MouseMove += new MouseEventHandler(_grid_MouseMove);
　　　　　　_grid.PreviewMouseLeftButtonDown += new MouseButtonEventHandler(_grid_PreviewMouseLeftButtonDown);
　　　　　　_grid.MouseLeftButtonUp += new MouseButtonEventHandler(_grid_MouseLeftButtonUp);
　　　　}
　　}

　　void _grid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
　　{
　　　　lfBtnStatus = true;
　　　　currentCellType = _grid.HitTest(e.GetPosition(_grid)).CellType;
　　　　hitTestcolumn = _grid.HitTest(e.GetPosition(_grid)).Column;
　　}

　　void _grid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
　　{
　　　　lfBtnStatus = false;
　　}

　　void _grid_MouseMove(object sender, MouseEventArgs e)
　　{
　　　　if (lfBtnStatus)
　　　　　　val = e.GetPosition(_grid).X;
　　}

　　void _grid_ResizingColumn(object sender, CellRangeEventArgs e)
　　{
　　　　e.Cancel = true;

　　　　if (e.CellType == CellType.ColumnHeader)
　　　　{
　　　　　　double fnlColumnWidth = val - _grid.Columns[e.Column].Left - _grid.TopLeftCells.Columns[0].ActualWidth;

　　　　　　if (fnlColumnWidth > _grid.Columns[e.Column].MinWidth)
　　　　　　　　_grid.Columns[e.Column].Width = new GridLength(fnlColumnWidth);
　　　　}
　　　　else if (e.CellType == CellType.TopLeft)
　　　　{
　　　　　　_grid.TopLeftCells.Columns[0].Width = new GridLength(val);
　　　　}
　　}
}