Sqlcommandbuilder automatically constructs SQL commands for images

String Sconnectonstring;
Sconnectonstring =   " Password = sa; user id = sa; initial catalog = Master; Data Source = (local) " ;
Sqlconnection objconn =   New Sqlconnection (sconnectonstring );
Objconn. open ();

Sqldataadapter daauthors =   New Sqldataadapter ( " Select * From city_users " , Objconn );
Dataset dsmaster =   New Dataset ( " Master " );
Daauthors. fillschema (dsmaster, schematype. source, " City_users " ); // Load the structure of the table so that you do not need to reset the primary key when loading the table to dataset.
Daauthors. Fill (dsmaster, " City_users " );
Dsmaster. Tables [ " City_users " ]. Rows [ 1 ] [ " User_name " ] =   " SQL " ; // Note that rows [1] Here, this 1 refers to the row number in the Table in dataset, which is inconsistent with the row number in the database 1

Sqlcommandbuilder objcommandbuilder =   New Sqlcommandbuilder (daauthors ); // Build SQL commands
Daauthors. Update (dsmaster, " City_users " ); // Update
// Daauthors. updatecommand = updatecomm;
// Daauthors. updatecommand. executenonquery ();
Objconn. Close ();