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How to find factorial of a number using C# and VB.net

Introduction: In this article i have explained how to get/find/calculate factorial of a number in asp.net.
  • In the design page(.aspx) place two text boxes and a button as:
<table>
            <tr>
                <td>
                    Enter number</td>
                <td>
                    <asp:TextBox ID="txtNumber" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td>
                    &nbsp;</td>
                <td>
                    <asp:Button ID="btnFactorial" runat="server" Text="Calculate factorial"
                        onclick="btnFactorial_Click" />
                </td>
            </tr>
            <tr>
                <td>
                    Output:</td>
                <td>
                    <asp:TextBox ID="txtFactorial" runat="server"></asp:TextBox>
                </td>
            </tr>
        </table>
  • Now in the code behind file(.aspx.cs) write the code as:

C#.Net Code to get/find/calculate factorial of a number using C# and VB.net

    protected void btnFactorial_Click(object sender, EventArgs e)
    {
        int count = 1, factorial = 1, number = 1, factorialNumber;

        factorialNumber = Convert.ToInt32(txtNumber.Text);

        while (count <= factorialNumber)
        {
            factorial = factorial * number;
            count++;
            number++;
        }

        txtFactorial.Text = factorial.ToString();
    }


VB.Net Code to get/find/calculate factorial of a number using C# and VB.net
  • Now in the code behind file(.aspx.vb) write the code as:
    Protected Sub btnFactorial_Click(ByVal sender As Object, ByVal e As EventArgs)
        Dim count As Integer = 1, factorial As Integer = 1, number As Integer = 1, factorialNumber As Integer

        factorialNumber = Convert.ToInt32(txtNumber.Text)

        While count <= factorialNumber
            factorial = factorial * number
            count += 1
            number += 1
        End While

        txtFactorial.Text = factorial.ToString()
    End Sub


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