Single.ToString Method (String)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Converts the numeric value of this instance to its equivalent string representation, using the specified format.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)


Public Function ToString ( _
    format As String _
) As String
public string ToString(
    string format


Return Value

Type: System..::.String
The string representation of the value of this instance as specified by format.


Exception Condition

format is invalid.


The return value can be PositiveInfinitySymbol, NegativeInfinitySymbol, NaNSymbol, or the string representation of a number, as specified by format.

The format parameter can be any valid standard numeric format specifier except for D and X, as well as any combination of custom numeric format specifiers. If format is nullNothingnullptra null reference (Nothing in Visual Basic) or an empty string, the return value is formatted with the general numeric format specifier ("G").

The return value is formatted using the NumberFormatInfo object for the current culture. To apply the formatting conventions of a specified culture, call the Single..::.ToString(String, IFormatProvider) method.

By default, the return value only contains 7 digits of precision although a maximum of 9 digits is maintained internally. If the value of this instance has greater than 7 digits, ToString(String) returns PositiveInfinitySymbol or NegativeInfinitySymbol instead of the expected number. If you require more precision, specify format with the "G9" format specification, which always returns 9 digits of precision, or "R", which returns 7 digits if the number can be represented with that precision or 9 digits if the number can only be represented with maximum precision.


The following example displays several Single values using each of the supported standard numeric format specifiers together with two custom numeric format strings. One of those custom format strings illustrates how to pad a Single value with leading zeroes. In converting the numeric values to strings, the example uses the formatting conventions of the en-US culture.

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0


Windows Phone

See Also


Single Structure

ToString Overload

System Namespace



Other Resources

Formatting Types