The default value for DataListRowCountGovernorMaxRowError setting in the app.config is 100,000 rows. You can increase it to an upward threshold of 1,000,000 rows, though the do not advise changing this setting.
We do not advise increasing this setting beyond its default value. 100,000 rows, the default, is the optimum maximum cap for reliable performance in the system. Exceeding this maximum opens the system to significant likelihood of performance degradation.
We suggest writing a custom business process for operations that need to occur on this large a number of records. If you choose to increase the app.config setting value beyond the suggested 100,000 rows, you will need to create custom SQL or other methods to limit the number of records returned before this process is called.