C# | Boolean.Parse() Method
Last Updated :
11 Jul, 2025
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This method is used to convert the specified string representation of a logical value to its Boolean equivalent.
Syntax:
public static bool Parse (string value);
Here, the value is the string which contains the value to convert.
Return Value: This method returns true if value is equivalent to TrueString false if value is equivalent to FalseString.
Exceptions:
- ArgumentNullException: If the string value is null.
- FormatException: If the value is not equivalent to TrueString or FalseString.
Below programs illustrate the use of Boolean.Parse(String) Method:
Example 1:
// C# program to demonstrate
// Boolean.Parse(String)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// passing different values
// to the method to check
checkParse("true");
checkParse("TRUE");
checkParse("false");
checkParse("FALSE");
checkParse(bool.TrueString);
checkParse(bool.FalseString);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining checkParse method
public static void checkParse(string input)
{
// declaring bool variable
bool val;
// getting parsed value
val = bool.Parse(input);
Console.WriteLine("'{0}' parsed as {1}", input, val);
}
}
// C# program to demonstrate// Boolean.Parse(String)// Methodusing System;class GFG { // Main Method public static void Main() { try { // passing different values // to the method to check checkParse("true"); checkParse("TRUE"); checkParse("false"); checkParse("FALSE"); checkParse(bool.TrueString); checkParse(bool.FalseString); } catch (ArgumentNullException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (FormatException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining checkParse method public static void checkParse(string input) { // declaring bool variable bool val; // getting parsed value val = bool.Parse(input); Console.WriteLine("'{0}' parsed as {1}", input, val); }}Output:
'true' parsed as True 'TRUE' parsed as True 'false' parsed as False 'FALSE' parsed as False 'True' parsed as True 'False' parsed as False
Example 2: For ArgumentNullException
// C# program to demonstrate
// Boolean.Parse(String)
// Method for ArgumentNullException
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// passing null value as a input
checkParse(null);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining checkparse method
public static void checkParse(string input)
{
// declaring bool variable
bool val;
// getting parsed value
val = bool.Parse(input);
Console.WriteLine("'{0}' parsed as {1}", input, val);
}
}
// C# program to demonstrate// Boolean.Parse(String)// Method for ArgumentNullExceptionusing System;class GFG { // Main Method public static void Main() { try { // passing null value as a input checkParse(null); } catch (ArgumentNullException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (FormatException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining checkparse method public static void checkParse(string input) { // declaring bool variable bool val; // getting parsed value val = bool.Parse(input); Console.WriteLine("'{0}' parsed as {1}", input, val); }}Output:
Exception Thrown: System.ArgumentNullException
Example 3: For FormatException
// C# program to demonstrate
// Boolean.Parse(String)
// Method for FormatException
using System;
class GFG {
// Main Method
public
static void Main()
{
try {
// passing true is not equivalent
// to true value as a input
checkParse("true");
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (FormatException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining checkParse method
public static void checkParse(string input)
{
// declaring bool variable
bool val;
// getting parsed value
val = bool.Parse(input);
Console.WriteLine("'{0}' parsed as {1}", input, val);
}
}
// C# program to demonstrate// Boolean.Parse(String)// Method for FormatExceptionusing System;class GFG { // Main Methodpublic static void Main() { try { // passing true is not equivalent // to true value as a input checkParse("true"); } catch (ArgumentNullException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (FormatException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining checkParse method public static void checkParse(string input) { // declaring bool variable bool val; // getting parsed value val = bool.Parse(input); Console.WriteLine("'{0}' parsed as {1}", input, val); }}Output:
Exception Thrown: System.FormatException
Note: The value parameter, optionally preceded or trailed by white space, must contain either TrueString or FalseString otherwise, it will throw an exception and the comparison is case-insensitive.
Reference:
