How to Generate Random Numbers Within a Specific Range

Introduction

Sometimes developers need to generate random numbers and for this you use Random class in C# that resides in the "System" namespace.



But what will you do when the client needs some specific random numbers within a range, like 100 to 200 or may be 1000 to 2000.

The following are the details for the preceding requirements.

Step 1

Create a new empty Website named "Website1'.



And add the Web form named "Deafult.aspx' into it.



Step 2

Add 2 Textboxes for "minimum value" and "maximum value" and a button in the "Deafult.aspx' page with the text "Generate Random Number in a Range' and a click event.



Step 3

Write the following code for the button click event.

• Create an object of "Random' class.

Random r = new Random();

• To get the next value of the random object, pass the textbox's value as a range after the integer conversion in the Next() method and save the output in an int variable named "num'.

int num=r.Next(Convert.ToInt32(TextBox1.Text), Convert.ToInt32(TextBox2.Text));

• Print the "num' variable.

Response.Write(num.ToString());

Step 4

After running the page:


Set some int value in both textboxes, like I have set 100 to 300 as the range.


Notes

• The maximum value should be greater than the minimum value, otherwise you will get an exception.
• You can only send int values, nothing else.
• You can also set only a minimum value without a maximum value.

After clicking the button, first I got the "285" as the random number.



And the second time, I got "199" as the random number.