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如何用0.00 in自动填充datagridview单元格值。NET如果单元格为空或null vlaue？

我对这个平台很陌生。请帮助我。目前我正在一个会计项目下处理日记账凭证。
这里是我的表 (DataGridView):
日记帐凭证
我想让它像这样:
如果.

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