谁知道“Unassigned Code”如何解决？

[peak_weng]

我用ADO.net 连接 interbase
string sql = "Select FSKenmerkCode,FsKenMerkwaarde from Projectkenmerken where FiProjectId="+projectid;
TAdoDbxCommand cmd = new TAdoDbxCommand();
cmd.CommandText = sql;
DataTable dt = DoQuery(cmd);

public DataTable DoQuery(TAdoDbxCommand command)
{
DataTable dataTable = new DataTable();
TAdoDbxConnection connection = this.OpenConnection();
command.Connection = connection;
try
{

TAdoDbxDataAdapter adapter = new TAdoDbxDataAdapter(command);
adapter.Fill(dataTable);

}
catch (Exception ex)
{
string str = ex.Message;
}
finally
{
command.Dispose();
connection.Close();
}
return dataTable;
}
当我用循环执行查询时，前一千条数据可以执行，但到一千条之后报错“Unassigned Code”
请问高手如何解决？

[peak_weng]

我是用interbase 数据库，
我试过参数化方法，可编译错误！
帮我写出来好么？

[peak_weng]

没人能解决这个问题么？

[懒牛科技]

Select FSKenmerkCode,FsKenMerkwaarde from Projectkenmerken where FiProjectId="+projectid;

改用参数化方法!