ASP.Net C# String Format function is used to build a dynamic string with formatted text that takes number of dynamic parameters to be filled at the runtime. In ASP.Net 2.0 you can use the C# string format function to display a dynamic string whose parameter depend on the returned values of other functions. You can pass upto 3 object type args to the string.Format function that builds the string. Curly brackets { } are used along with index of argument whose value is automatically filled at its defined place e.g. {0} {1} {2}. Value of first object argument is passed at the place of {0}, second argument value is passed at {2} and so on. If there are more than 3 value parameters then you can create an array of argument values that can be passed as a collection of arguments to the string format function.

Following are the overloads for the C# string.Format Function:

1. public static string Format(string format, object arg0);
   
   
2. public static string Format(string format, params object[] args);
   
   
3. public static string Format(IFormatProvider provider, string format, params object[] args);
   
   
4. public static string Format(string format, object arg0, object arg1);
   
   
5. public static string Format(string format, object arg0, object arg1, object arg2);

Syntax for ASP.Net C# String Format Function

string. Format("Hello {0} !!!", "World");

Above sample syntax example code shows the use of string.Format function that will generate the Output as Hello World!!!

Examples of ASP.Net C# Srting.Format Function

string arg0 = "arg0";


string arg1 = "arg1";


string arg2 = "arg2";


Response.Write(string.Format("String Format Function Passed with 1 Arg: {0} <br />", arg0));


Response.Write(string.Format("String Format Function Passed with 2 Args: {0} and {1} <br />", arg0, arg1));


Response.Write(string.Format("String Format Function Passed with 3 Args: {0}, {1}, {2} <br />", arg0, arg1, arg2));

String Format Function Passed with 1 Arg: arg0


String Format Function Passed with 2 Args: arg0 and arg1


String Format Function Passed with 3 Args: arg0, arg1, arg2


String Format Function Passed using Array of 4 Args: arg0, arg1, arg2, arg3


String Format Function with CultureInfo IFormatProvider and Array of 4 Args: arg0, arg1, arg2, arg3


String Format Function to Convert Decimal to Hexadecimal: FF


String Format Function to Convert Decimal to Scientific Number: 2.550000E+002


String Format Function to Convert Decimal to Number Format: 255.00


String Format Function to Convert Number to Currency: $255.00


String Format Function to Convert to Number Format: 123,456,789.00

In the examples you can see that we have used some format types such as {0:X}, {0:E}, {0:N}, {0:C}. These formats work as follows:

{0:X} converts decimal number to hexadecimal.

{0:E} converts decimal number to scientific exponential form.

{0:N} converts decimal number to number format.

{0:C} converts number to currency format.