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Convert.ToSingle Method (String)

.NET Framework 1.1

Converts the specified String representation of a number to an equivalent single-precision floating point number.

[Visual Basic]
Overloads Public Shared Function ToSingle( _
   ByVal value As String _
) As Single
public static float ToSingle(
 string value
public: static float ToSingle(
 String* value
public static function ToSingle(
   value : String
) : float;


A String containing a number to convert.

Return Value

A single-precision floating point number equivalent to the value of value.


Zero if value is a null reference (Nothing in Visual Basic).


Exception Type Condition
ArgumentException value is a null reference (Nothing in Visual Basic).
FormatException value does not consist of an optional sign followed by a sequence of digits (zero through nine).
OverflowException value represents a number less than MinValue or greater than MaxValue.


The return value is the result of invoking the Single.Parse method on value.


[Visual Basic, C#, C++] The following code sample illustrates the conversion of a String to Single, using ToSingle:

[Visual Basic] 
Public Sub ConvertStringFloat(ByVal stringVal As String)
    Dim singleVal As Single = 0

        singleVal = System.Convert.ToSingle(singleVal)
        System.Console.WriteLine("The string as a single is {0}.", _
    Catch exception As System.OverflowException
        System.Console.WriteLine( _
            "Overflow in string-to-single conversion.")
    Catch exception As System.FormatException
        System.Console.WriteLine( _
            "The string is not formatted as a Single.")
    Catch exception As System.ArgumentException
        System.Console.WriteLine("The string is null.")
    End Try

    ' Single to string conversion will not overflow.
    stringVal = System.Convert.ToString(singleVal)
    System.Console.WriteLine("The single as a string is {0}.", _
End Sub

public void ConvertStringFloat(string stringVal) {
    float floatVal = 0;
    try {
        floatVal = System.Convert.ToSingle(stringVal);
            "The string as a float is {0}.", floatVal);
    catch (System.OverflowException){
            "The conversion from string-to-float overflowed.");
    catch (System.FormatException) {
            "The string is not formatted as a float.");
    catch (System.ArgumentNullException) {
            "The string is null.");

    // Float to string conversion will not overflow.
    stringVal = System.Convert.ToString(floatVal);
        "The float as a string is {0}.", stringVal);


   void ConvertStringFloat(String* stringVal)
      float floatVal = 0;

      try {
         floatVal = System::Convert::ToSingle(stringVal);
         System::Console::WriteLine(S"The String* as a float is {0}.", __box(floatVal));
      } catch (System::OverflowException*) {
         System::Console::WriteLine(S"The conversion from String*-to-float overflowed.");
      } catch (System::FormatException*) {
         System::Console::WriteLine(S"The String* is not formatted as a float.");
      } catch (System::ArgumentNullException*) {
         System::Console::WriteLine(S"The String* is 0.");

      // Float to String* conversion will not overflow.
      stringVal = System::Convert::ToString(floatVal);
      System::Console::WriteLine(S"The float as a String* is {0}.", stringVal);

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework, Common Language Infrastructure (CLI) Standard

See Also

Convert Class | Convert Members | System Namespace | Convert.ToSingle Overload List