[Solved] ExecuteReader: Connection property has not been initialized. Browser Game [closed]

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You didn’t connect your SqlConnection and SqlCommand.

Just define your connection as a second parameter like;

SqlCommand CheckExp = new SqlCommand("SELECT Experience FROM Player WHERE UserID=@uid", connection);

Or you can assing your SqlCommand.Connection property like;

CheckExp.Connection = connection;

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solved ExecuteReader: Connection property has not been initialized. Browser Game [closed]