To modify existing records, use UPDATE statements.

Update Syntax

The UPDATE statement takes as input a comma-separated list of columns and new column values as name-value pairs in the SET clause, as shown in the following example:

UPDATE <table_name> SET <select_statement> | {<column_reference> = <expression> [ , ... ]} WHERE { Id = <expression>  } [ { AND | OR } ... ] 

<expression> ::=
  | @ <parameter> 
  | ?
  | <literal>

You can use the ExecuteNonQuery method to execute data manipulation commands and retrieve the rows affected, as shown in the following example:

C#

String connectionString = "InitiateOAuth=GETANDREFRESH;ContentOwnerId=MyContentOwnerId;ChannelId=ChannelId;";
using (YouTubeAnalyticsConnection connection = new YouTubeAnalyticsConnection(connectionString)) {
  int rowsAffected;
  YouTubeAnalyticsCommand cmd = new YouTubeAnalyticsCommand("UPDATE Groups SET ContentDetails_ItemType='youtube#playlist' WHERE Id = @myId", connection);
  cmd.Parameters.Add(new YouTubeAnalyticsParameter("myId","S"));
  rowsAffected = cmd.ExecuteNonQuery();
}

VB.NET

Dim connectionString As [String] = "InitiateOAuth=GETANDREFRESH;ContentOwnerId=MyContentOwnerId;ChannelId=ChannelId;"
Using connection As New YouTubeAnalyticsConnection(connectionString)
  Dim rowsAffected As Integer
  Dim cmd As New YouTubeAnalyticsCommand("UPDATE Groups SET ContentDetails_ItemType='youtube#playlist' WHERE Id = @myId", connection)
  cmd.Parameters.Add(New YouTubeAnalyticsParameter("myId", "S"))
  rowsAffected = cmd.ExecuteNonQuery()
End Using