How to: Specify Default Data Types for Columns
You can change the default data type for new columns created in Table Designer.
Note
The dialog boxes and menu commands you see might differ from those described in Help depending on your active settings or edition. To change your settings, choose Import and Export Settings on the Tools menu. For more information, see Visual Studio Settings.
To specify the default data type
From the Tools menu, click Options.
In the Options dialog box, expand Database Tools, expand Table Designer, then click Column Options.
In the Column Options dialog box, select a default column type from the Default Column Type drop-down list and click OK.
New columns that you create in Table Designer will now use the data type you have specified by default.