Hi,

I would like to know if you have an easy way to implement Undo-Redo on all node action (Moving, deleting, adding, rename, drag and drop from one control to another, etc...)?

The only way I found is to save all the control structure in xml temp file after each change but this way is absolutely not efficient... I would like to know if there is a better and faster way.

Thanks in advance for your help.

Best regards,

Fred

Hi,

I am displaying customer data [Id, Name and Address] in grid view. I also need to display some calculated value “Customer Points” in the grid. For the “Customer Points” I have added a GridViewTextBoxColumn “txtCustomerPoints” to the grid.

For displaying data in “txtCustomerPoints” i am using the CellFormatting Event as below:

        private void RadGridView1_CellFormatting(object sender, CellFormattingEventArgs e)

        {

            try

            {

                string columnUniqueName = ((GridViewDataColumn)e.CellElement.ColumnInfo).UniqueName;

                if (columnUniqueName == "txtCustomerPoints " )

                {

                    if (IsColumnExistsInGrid(RadGridView1.MasterGridViewTemplate, columnUniqueName))

                    {

                        RadGridView1.GridElement.BeginUpdate();

                        e.CellElement.RowInfo.Cells[columnUniqueName].Value = "Some Calculated Value";

                        RadGridView1.GridElement.EndUpdate();

                    }

                }

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

But this generate an error on this line:

e.CellElement.RowInfo.Cells[columnUniqueName].Value = "Some Calculated Value";

The error is:

ex = {"Object reference not set to an instance of an object."}               

StackTrace       "   at MSMainPrj.FormsEmbedded.Booking. RadGridView1_ValueChanging(Object sender, ValueChangingEventArgs e) in D:\\Users\\Yaqub.Ahmad\\CS2\\trunk\\code\\MSMainPrj\\FormsEmbedded\\Booking.cs:line 1755\r\n   at Telerik.WinControls.UI.RadGridView.OnValueChanging(Object sender, ValueChangingEventArgs e)\r\n   at Telerik.WinControls.UI.RadGridView.CallValueChanging(Object sender, ValueChangingEventArgs e)\r\n   at Telerik.WinControls.UI.GridViewCellInfo.set_Value(Object value)\r\n   at MSMainPrj.Libraries.TelerikGridHelper.SetGridColumnValue(RadGridView grid, CellFormattingEventArgs e, String columnName, Object value) in D:\\Users\\Yaqub.Ahmad\\CS2\\trunk\\code\\MSMainPrj\\Libraries\\TelerikGridHelper.cs:line 292"      string

TargetSite         {Void RadGridView1_ValueChanging(System.Object, Telerik.WinControls.UI.ValueChangingEventArgs)}      System.Reflection.MethodBase {System.Reflection.RuntimeMethodInfo}

Kindly help me to update a custom column's value.

Thanks.