Question

i have a button on win form , which delete row on grid view.

numberSettingTable.SelectedRows[0]

Problem is when i press the button without row selection it send null, in java -1 was return which tells that no rows are selected. So how can i achieve the same in c#?.

I have tried if statement

numberSettingTable.SelectedRows[0] != null

But it didnt worked.

Following is the error detail.

System.ArgumentOutOfRangeException was unhandled
Message=Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Source=mscorlib
ParamName=index
StackTrace:
at System.Collections.ArrayList.get_Item(Int32 index)
at System.Windows.Forms.DataGridViewSelectedRowCollection.get_Item(Int32 index)
at VetoSmsServer.mainForm.removeEntryBt_Click(Object sender, EventArgs e) in C:\WorkSpace\VetoSmsServer\VetoSmsServer\mainForm.cs:line 310
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at VetoSmsServer.Program.Main() in C:\WorkSpace\VetoSmsServer\VetoSmsServer\Program.cs:line 18
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:

Answer 1

You need to check if there is any row selected in your DataGridView control. If there is you can delete the first selected or all selected. The following snippet is demonstrating deleting of the only one selected row. Also you should pay attention not to try to delete the new row that is uncommitted. Therefore, you could use the lines:

DataGridViewRow dgrvr = numberSettingTable.SelectedRows[0];
          if(!dgrvr.IsNewRow)

The full code snippet is like this:

if(numberSettingTable.SelectedRows.Count>0)
{
      DataGridViewRow dgrvr = numberSettingTable.SelectedRows[0];
      if(!dgrvr.IsNewRow)
           numberSettingTable.Rows.Remove(dgrvr);   
}

in order to delete multiple selected rows, just iterate trough SelectedRows collection.