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var id = 5;
var strQuery = @"SELECT Id, Amount FROM Orders WHERE Id = @Id";
var cmdQuery = new SqlCommand(strQuery, connection);
cmdQuery.Parameters.Add("@Id", id);
var id = 5;
var strPattern = @"SELECT Id, Amount FROM Orders WHERE Id = {0}";
var strQuery = string.Format(strPattern, id);
var cmdQuery = new SqlCommand(strQuery, connection);