To delete information from a table, use DELETE statements.

DELETE Syntax

The DELETE statement requires the table name in the FROM clause and the row's primary key in the WHERE clause, as shown in the following example:

<delete_statement> ::= DELETE FROM <table_name> WHERE { Id = <expression> } [ { AND | OR } ... ]

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

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

C#

String connectionString = "User=myuseraccount;Password=mypassword;URL=https://myOrg.crm.dynamics.com/;CRM Version=CRM Online;";
using (DynamicsCRMConnection connection = new DynamicsCRMConnection(connectionString)) {
  int rowsAffected;
  DynamicsCRMCommand cmd = new DynamicsCRMCommand("DELETE FROM Lead WHERE Id = @myId", connection);
  cmd.Parameters.Add(new DynamicsCRMParameter("myId","1045625d-99ee-e011-a272-00155d01ad6b"));
  rowsAffected = cmd.ExecuteNonQuery();
}

VB.NET

  
Dim connectionString As [String] = "User=myuseraccount;Password=mypassword;URL=https://myOrg.crm.dynamics.com/;CRM Version=CRM Online;"
Using connection As New DynamicsCRMConnection(connectionString)
  Dim rowsAffected As Integer
  Dim cmd As New DynamicsCRMCommand("DELETE FROM Lead WHERE Id = @myId", connection)
  cmd.Parameters.Add(New DynamicsCRMParameter("myId", "1045625d-99ee-e011-a272-00155d01ad6b"))
  rowsAffected = cmd.ExecuteNonQuery()
End Using