CreateBigQueryTable.cs

var bigquery = new BigqueryService(new BaseClientService.Initializer
{
  ApplicationName = "BigQuery Sample",
  ApiKey = "ApiKey"
});
await bigquery.Tables.Insert(new Table
{
  FriendlyName = "MyTableFriendyName",
  Description = "My Table Description",
  Schema = new TableSchema
  {
    Fields = new[]
    {
      new TableFieldSchema
      {
        Name = "date",
        Type = "TIMESTAMP",
        Mode = "REQUIRED",
        Description = "Date"
      }, 
      new TableFieldSchema
      {
	Name = "source",
	Type = "STRING",
	Mode = "REQUIRED",
	Description = "Text"
      }, 
    }
  },
  TableReference = new TableReference
  {
    ProjectId = "myproject",
    DatasetId = "mydataset",
    TableId = "mytable"
  }
},
"myproject", "mydataset").ExecuteAsync();