How is wrong on function ExecuteNonQuery to work as Best Pra

Question

I work on c# app I need to make function make insert data or update or delete dynamically so that I do function below for insert

or update or delete but I don't know what must added or remove from function below to make function work as best practice .

public static async Task<int> ExecuteNonQuery(string sql, SqlConnection sqlconnection, DbParameter[] @params = null, CommandType cmdType = CommandType.StoredProcedure)
    {
        int RecordsCount = 0;


            if (sql == "") return 0;
            await Task.Run(async () =>
            {
                using (var con = new SqlConnection(GlobalVariables.con))
                {
                    using (var cmd = new SqlCommand() { Connection = con })
                    {


                        if (cmd.CommandTimeout < 360)
                            cmd.CommandTimeout = 360;
                        cmd.CommandText = sql;
                        cmd.CommandType = cmdType;
                        cmd.Parameters.Clear();
                        if (@params != null)
                        {
                            for (int i = 0; i < @params.Length; i++)
                            {
                                cmd.Parameters.Add(@params[i]);
                            }
                        }
                        try
                        {
                            await con.OpenAsync();

                           RecordsCount = (await cmd.ExecuteNonQueryAsync());
                        }
                        catch (Exception ex)
                        {
                            throw new Exception(ex.Message);
                        }
                    }

                }


            });
        return RecordsCount;
    }

so I do function above for make insert or update or delete

what is remaining or wrong to be best practice ?