I believe the connection string should be something like,
"Data Source=DESKTOP-VRO75JO\\\\KAMI123..."
or
@"Data Source=DESKTOP-VRO75JO\\KAMI123..."
Please do refer
MSDN Link | Escape Sequences
将连接的数据源从DESKTOP-VRO75JO\\KAMI123
为DESKTOP-VRO75JO\\\\KAMI123
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