### 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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