How to use Regular Expression Validator for Textbox Control in ASP.NET

The Following example shows, how to use the Regular Expression Validator to validate the Textbox, it allows only numbers(integer values only).

I have a Textbox control called txtAge:

<asp:TextBox ID="txtAge" runat="server"></asp:TextBox>

Here I can use the Regular Expression in 2 methods.

Method 1: (Client Side validation)

<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
runat="server" ControlToValidate="txtAge"
ErrorMessage="Enter Valid Age"
EnableClientScript="true"
ValidationExpression="\d+">
</asp:RegularExpressionValidator>

Exp: EnableClientScript="true", represents the client side validation.

Method 2: (Server Side validation)

<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
runat="server" ControlToValidate="txtAge"
ErrorMessage="Enter Valid Age"
ValidationGroup="validate"
ValidationExpression="\d+">
</asp:RegularExpressionValidator>

Exp: ValidationGroup="validate", it will validate the textbox when a server side event hits. Like button click.

For that you have to use the button with the same validation group.

<asp:Button ID="btnSubmit" runat="server" Text="Submit" ValidationGroup="validate" />

From the above Regular Expression Validator, we have to mention the validation expression in ValidationExpression. Here I have used the Validation Expression as "\d+" which represents only numbers.

We can mention the Validation Expression as "\d{6}", it represents totally six digits should be entered in Age textbox. It's mainly used for Postal (Zip) code, age validation and etc.

Crystal Report : Group wise total at the Group Header

To show the Group wise total at the group header in Crystal Reports,

Follow the following steps.,
1. Create a Crystal report formula.
2. Use the following expression
sum ({tablename.field_to_summarize}, {tablename.field_you_wanna_grouping_on})
3. Place the created formula in the required group header.

Indian rupee format in crystal reports

Method-1:
Step-1 : Create new formula and go-on with editor
Step-2 : Copy the following formula and paste it in the coding part  
                      Cstr({FieldName},"##,##,##,##0.00") or CStr({FieldName}, "##,##,##,###.##") 
 
ie., {FieldName}-- The Amount Field Name

Method-2 :
Step-1 : Create new formula and go-on with editor
Step-2 : Copy the following formula and paste it in the coding part  

                      StringVar Amt;
                      StringVar s;
                      NumberVar N;
                      Amt:=Replace(Totext({FieldName}),",","");
                      s:=left(Amt,len(Amt)-3);
                      N:=len(s);
                      Select N
                      case 4:
                      left(s,1)&","& right(s,3) & ".00"
                      case 5:
                      left(s,2)&","& right(s,3)& ".00"
                      case 6:
                      left(s,1)&","& mid(s,2,2) & "," & right(s,3)& ".00"
                      case 7:
                      left(s,2)&","& mid(s,3,2) & "," & right(s,3)& ".00"
                      case 8:
                      left(s,1)&","& mid(s,3,2) & "," & mid(s,6,2) & "," & right(s,3)& ".00"
                      case 9:
                      left(s,2)&","& mid(s,3,2) & "," & mid(s,6,2) & "," & right(s,3)& ".00"
                     default:
                      s; 

ie., {FieldName}-- The Amount Field Name

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ASP.NET--Custom Validation Expression's

Some of the expression's that are used for validating the fields in the web form in ASP.NET

For Name:
^[a-zA-Z\s,.]{1-50}$

For Mobile Number:
^[7-9]{1}[0-9]{9}$

For Land-line Number:
^[0-9,\s,-]{10,13}$

For Car Registration Number:
^[a-zA-Z]{2}[0-9]{2}[a-zA-Z]{1,2}[0-9]{1,4}$

For E.mail:(Regular Expression)
\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

For Website:
^((h|H?)(t|T?)(t|T?)(p|P?)(s|S?)\://)?(www.|[a-zA-Z0-9].)[a-zA-Z0-9\-\]+\.[a-zA-z]*$

Explanation:

^ and $                  -     For represents the Custom validation

a-z and A-Z            -     Letters from alphabets both upper and lower

0-9                        -     Numbers 0,1,2,3,4,5,6,7,8,9

\s (or) \S                -     Space between strings

{1,30} (or) {1,50}    -     Range or Count of the values. ex.  {min,max}

?                           -     For optional