Here, we will see how to generate random
password in ASP.NET. Drag and drop two TextBox and one Control on the form. One
TextBox to give the length of the TextBox other to displays random password
according to length when we click on the Button control.
The form looks like below figure.
Figure1
.ASPX code
<body>
<form id="form1" runat="server">
<div>
Password Length:
<asp:TextBox ID="txtPassLength" runat="server"></asp:TextBox>
<br />
<br />
Random Password:
<asp:TextBox ID="txtpassword" runat="server"></asp:TextBox>
<br />
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Generate Password" />
<br />
</div>
</form>
</body>
Now double click on the Button control and add
the following code.
VB code
Protected Sub Button1_Click(ByVal
sender As Object,
ByVal e As EventArgs) Handles
Button1.Click
Dim allowedChars As String = ""
allowedChars = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,"
allowedChars += "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,"
allowedChars += "1,2,3,4,5,6,7,8,9,0,!,@,#,$,%,&,?"
Dim sep As Char() = {","c}
Dim arr As String() = allowedChars.Split(sep)
Dim passwordString As String = ""
Dim temp As String = ""
Dim rand As New Random()
For i As Integer = 0 To Convert.ToInt32(txtPassLength.Text) - 1
temp =
arr(rand.[Next](0, arr.Length))
passwordString +=
temp
Next
txtpassword.Text =
passwordString
End Sub
C# code
protected void Button1_Click(object
sender, EventArgs e)
{
string allowedChars =
"";
allowedChars =
"a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,";
allowedChars +=
"A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,";
allowedChars +=
"1,2,3,4,5,6,7,8,9,0,!,@,#,$,%,&,?";
char[] sep = { ','
};
string[] arr = allowedChars.Split(sep);
string passwordString =
"";
string temp = "";
Random rand = new Random();
for (int i = 0;
i < Convert.ToInt32(txtPassLength.Text); i++)
{
temp =
arr[rand.Next(0, arr.Length)];
passwordString
+= temp;
}
txtpassword.Text =
passwordString;
}
Now run the application.
Figure2
Now give the length of the password.
Figure3
Now click on the Button to generate random password.
Figure4