Error in adding ConnectionString in Visual Studio 2015

I am getting error in adding ConnectionString from Database. Can you please guide me?

Solution

I believe the connection string should be something like,

"Data Source=DESKTOP-VRO75JO\\KAMI123..."

@"Data Source=DESKTOP-VRO75JO\KAMI123..."

Please do refer

MSDN Link | Escape Sequences

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