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Convert.ToUInt32 Method (Object)

Converts the value of the specified object to a 32-bit unsigned integer.

This API is not CLS-compliant. 

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

<CLSCompliantAttribute(False)> _
Public Shared Function ToUInt32 ( _
	value As Object _
) As UInteger
Dim value As Object 
Dim returnValue As UInteger 

returnValue = Convert.ToUInt32(value)


Type: System.Object

An object that implements the IConvertible interface, or Nothing.

Return Value

Type: System.UInt32
A 32-bit unsigned integer that is equivalent to value, or 0 (zero) if value is Nothing.


value is not in an appropriate format.


value does not implement the IConvertible interface.


The conversion is not supported.


value represents a number that is less than UInt32.MinValue or greater than UInt32.MaxValue.

The return value is the result of invoking the IConvertible.ToUInt32 method of the underlying type of value.

The following example attempts to convert each element in an object array to an unsigned integer.

Dim values() As Object = { True, -12, 163, 935, "x"c, #5/12/2009#, _
                           "104", "103.0", "-1", _
                           "1.00e2", "One", 1.00e2, 16.3e42}
Dim result As UInteger

For Each value As Object In values
      result = Convert.ToUInt32(value)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        value.GetType().Name, value)
   Catch e As FormatException
      Console.WriteLine("The {0} value {1} is not in a recognizable format.", _
                        value.GetType().Name, value)
   Catch e As InvalidCastException
      Console.WriteLine("No conversion to a UInt32 exists for the {0} value {1}.", _
                        value.GetType().Name, value)

   End Try 
' The example displays the following output: 
'    Converted the Boolean value True to the UInt32 value 1. 
'    The Int32 value -12 is outside the range of the UInt32 type. 
'    Converted the Int32 value 163 to the UInt32 value 163. 
'    Converted the Int32 value 935 to the UInt32 value 935. 
'    Converted the Char value x to the UInt32 value 120. 
'    No conversion to a UInt32 exists for the DateTime value 5/12/2009 12:00:00 AM. 
'    Converted the String value 104 to the UInt32 value 104. 
'    The String value 103.0 is not in a recognizable format. 
'    The String value -1 is outside the range of the UInt32 type. 
'    The String value 1.00e2 is not in a recognizable format. 
'    The String value One is not in a recognizable format. 
'    Converted the Double value 100 to the UInt32 value 100. 
'    The Double value 1.63E+43 is outside the range of the UInt32 type.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0