| Class Library Name | VB Name | C# Name | Contains |
| Byte | Byte | byte | An integer from 0 to 255. |
| Int16 | Short | short | An integer from –32,768 to 32,767. |
| Int32 | Integer | int | An integer from –2,147,483,648 to 2,147,483,647. |
| Int64 | Long | long | An integer from about –9.2e18 to 9.2e18. |
| Single | Single | float | A single-precision floating point number from approximately –3.4e38 to 3.4e38. |
| Double | Double | double | A double-precision floating point number from |
| approximately –1.8e308 to 1.8e308. | |||
| Decimal | Decimal | decimal | A 128-bit fixed-point fractional number that |
| supports up to 28 significant digits. | |||
| Char | Char | char | A single 16-bit Unicode character. |
| String | String | string | A variable-length series of Unicode characters. |
| Boolean | Boolean | bool | A true or false value. |
| DateTime | Date | * | Represents any date and time from 12:00:00 AM, |
| January 1 of the year 1 in the Gregorian calendar, | |||
| to 11:59:59 PM, December 31 of the year 9999. | |||
| Time values can resolve values to 100 nanosecond | |||
| increments. Internally, this data type is stored as a 64-bit integer. | |||
| TimeSpan | * | * | Represents a period of time, as in ten seconds or |
| three days. The smallest possible interval is 1 tick | |||
| (100 nanoseconds). | |||
| Object | Object | object | The ultimate base class of all .NET types. Can |
| contain any data type or object. |
TimeSpan mytime;/*我想,要使用TimeSpan类型,必须得加上一个前缀,例如System.Time.TimeSpan,这个不一定正确,只是打个比方*/
其他存在的数据类型也可以这样定义.
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