Update virtualmode.cpp

Avoid .AllCells, as it loads the entire table regardless of Virtual Mode

Author: tumblingstuff

dotnet-desktop-guide/samples/snippets/cpp/VS_Snippets_Winforms/System.Windows.Forms.DataGridView.VirtualMode/CPP/virtualmode.cpp

@@ -132,7 +132,7 @@ public ref class Form1: public Form
       contactNameColumn->Name = L"Contact Name";
       this->dataGridView1->Columns->Add( companyNameColumn );
       this->dataGridView1->Columns->Add( contactNameColumn );
-	  this->dataGridView1->AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode::AllCells;
+	  this->dataGridView1->AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode::DisplayedCells;
 
       // Add some sample entries to the data store. 
       this->customers->Add( gcnew Customer( L"Bon app'",L"Laurence Lebihan" ) );