C# DataTable实现DropDownList第一笔空-Adding blank row to datatable's top

C# 使用DataTable实现DropDownList第一笔空DataTable-Adding new blank row to datatable's top
代码如下，Coding Below

1. DataRow dr = dtDataTable.NewRow();
   
2. dtDataTable.Rows.InsertAt(dr, 0);

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