How to make particular cell in datagrid readonly

Question

Hi I populated the employee payroll data (name department noofdays salary deduction) into datagrid. now the situation is one can change the value of the deduction column if noofdays column value is > 15. I need to make few cells in the complete grid readonly i tried setting the column property to readonly which makes the complete column so. Your help is highly appreciated. Ram

Administrator · Answer

Should be: protected override void Paint(Graphics grRectangle bndCurrencyManager srcint rowBrush bbBrush fbbool algn) { ea=new CancelEventArgs(ReadOnly); if(Activation!=null) Activation(thisea); if(!ea.Cancel) { bb=new SolidBrush(...); fb=new SolidBrush(...); } base.Paint(grbndsrcrowbbfbalgn); }

Administrator · Answer

Create classes inherited from DataGridColumnStyle(s): DataGridBoolColumn DataGridTextBoxColumn and override some code ... 1. Add event to check if the cell is readolnly or no like Validating or something like it - with row number in EventArgs for instance public event CancelEventHandler Activation; 2. Override Edit() method using this event. protected override void Edit(CurrencyManager Sourceint RownumRectangle Boundsbool ReadOnlystring InstantTextbool CellIsVisible) { ea=new CancelEventArgs(ReadOnly); if(Activation!=null) Activation(thisea); if(ea.Cancel) base.Edit(SourceRownumBoundsReadOnlyInstantTextCellIsVisible); } 3. Override Paint() method to change unreadable cell colors etc. protected override void Paint(Graphics grRectangle bndCurrencyManager srcint rowBrush bbBrush fbbool algn) { ea=new CancelEventArgs(ReadOnly); if(Activation!=null) Activation(thisea); if(!ea.Cancel) { bb=new SolidBrush(...); fb=new SolidBrush(...); } } 4. Use Your column classes with DataGrid and specify which cells would be readonly in Acitation() event handler. 5. Not tested. Similar solutions works at me. -or- try to inherit from DataGrid (may be it will be simpler but I don't know how to do it). May be override ColumnStartedEditing() method