Missing Implementation for GetData() in Examples Section

### Type of issue

Missing information

### Description

In the examples section, there is a code block with just a single curved bracket "}" (the code block after the Customer class). It seems that it should contain the code for the GetData() function.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.windows.controls.datagrid?view=windowsdesktop-8.0

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.Windows.Controls/DataGrid.xml

### Document Version Independent Id

286531bc-d867-65fd-3ce7-40ba01c1d1a5

### Article author

@dotnet-bot