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Searches for the specified character and returns the zero-based index of the first occurrence within the entire source string.

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

Syntax

Visual Basic (Declaration)
Public Overridable Function IndexOf ( _ source As String, _ value As Char _ ) As Integer

C#
public virtual int IndexOf( string source, char value )

Visual C++
public: virtual int IndexOf( String^ source, wchar_t value )

JavaScript
function indexOf(source, value);

The zero-based index of the first occurrence of value within the entire source, if found; otherwise, -1.

Exceptions

Exception	Condition
System..::.ArgumentNullException	source is null.