fetch only last 4 digit in c#

Question

0.00/5 (No votes)

See more:

i have a gridview control...i wanna show only last 4 digit of credit card no in this grid view...how to make substring in c#??

Posted 21-Jan-14 23:10pm

Member 10276220

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

thatraja · Answer 1 · 2014-01-21T23:44:00

Solution 2

Why Substring? Go RIGHT[^]

C#

string CCNo = "0000000000000000";
string XXNo = "XXXXXXXXXXXX";
string MaskedCCNo = String.Format("{0}{1}", XXNo, CCNo.Right(4));

You could simplify this code too.

Posted 21-Jan-14 23:44pm

thatraja

Karthik_Mahalingam · Answer 2 · 2014-01-21T23:14:00

Solution 1

Try this.

C#

string creditNumber = "1111222233334444"; ;
        var last4 = creditNumber.Substring(creditNumber.Length - 4, 4);

Reference:SubString[^]

Sample:

C#

<asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server" OnRowDataBound="GridView1_RowDataBound">
       <Columns>
           <asp:BoundField DataField="credit" HeaderText="credit" />
           <asp:BoundField DataField="last4"  HeaderText="last4" />
       </Columns>
   </asp:GridView>

C#

protected void Page_Load(object sender, EventArgs e)
       {
           if (!Page.IsPostBack)
           {

               DataTable dt = new DataTable();
               dt.Columns.Add("credit", typeof(string));
               dt.Columns.Add("last4", typeof(string));
               dt.Rows.Add("11112222333344444","" );
               dt.Rows.Add("11112222333344444" ,"");

               GridView1.DataSource = dt;
               GridView1.DataBind();
           }
       }

       protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
       {
           if (e.Row.RowType == DataControlRowType.DataRow)
           {
               string creditNumber = DataBinder.Eval(e.Row.DataItem, "credit")+"";
               var last4 = creditNumber.Substring(creditNumber.Length - 4, 4);
               e.Row.Cells[1].Text = last4;

           }
       }

Posted 21-Jan-14 23:14pm

Karthik_Mahalingam

Updated 21-Jan-14 23:19pm

v2

Comments

Member 10276220 22-Jan-14 5:15am

i wanna show it in gridview
this is my code:
<itemtemplate>XXXXXXXXXXXX<%#Eval("CreditCardNumber").ToString().Substring(12,4) %>

but i am getting error

Member 10276220 22-Jan-14 5:17am

i wanna show it in gridview
this is my code:
<asp:TemplateField HeaderStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Middle" HeaderStyle-Height="30px">
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" />
<HeaderTemplate>Credit Card No</HeaderTemplate>
<itemstyle>
<itemtemplate>XXXXXXXXXXXX<%#Eval("CreditCardNumber").ToString().Substring(12,4) %>

but i am getting error

Karthik_Mahalingam 22-Jan-14 5:19am

check my latest solution..

Karthik_Mahalingam 22-Jan-14 5:22am

try this

<asp:TemplateField HeaderStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Middle"
HeaderStyle-Height="30px">
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" />
<HeaderTemplate>
Credit Card No</HeaderTemplate>
<itemtemplate>
<%# Eval("CreditCardNumber").ToString().Substring(Eval("CreditCardNumber").ToString().Length -4, 4)%>

Member 10276220 22-Jan-14 6:28am

thank you....

Karthik_Mahalingam 22-Jan-14 6:38am

if your issue is resovled, pls close this post...

Member 11862078 4-Dec-17 2:53am

2345*****6789

Rahul VB 22-Jan-14 5:25am

Why to use var?

Karthik_Mahalingam 22-Jan-14 5:28am

i have to use string only..
i got used to use "VAR"
it is a variant datatype... it will assign the data type on compile time as well as runtime..
it is similar to object datatype.. and object datatype can be assigned to var, it wil not throw error :) nice no :)

Rahul VB 22-Jan-14 7:16am

var is also used so that the compiler type infers the type to which you assign var. Used mostly in Javascript. Object can be assigned to var because object is the base of all types.
Base = new Derived works if Base = object. No cast is required, but in vice versa a cast will be required.
Even if the code works, it can throw a run time error. I think because you have instantiated and assigned a type to the base type whose member doesnt exist.

So how can you access a member which is not present. I hope what i am saying is not nonsense. If i am wrong please correct me.

I want to get over the feeling of "Accepted Wisdom". One should know the exact reason. I tried reading ILDASM code, but i get irritated soon evaluating that code.hahaha

So please correct me if i am wrong and yes it is one the wonderful features which the language offers.

Karthik_Mahalingam 22-Jan-14 7:35am

have a look at this.. you have answer..
http://www.codeproject.com/Articles/233553/Difference-between-Object-Dynamic-and-Var

http://www.codeproject.com/Articles/661824/Dynamic-vs-Var-vs-Object

http://msdn.microsoft.com/en-us/library/ms173149.aspx