C# Character Escape Sequences

Character combinations consisting of a backslash (\) followed by a letter or by a combination of digits are called "escape sequences." To represent a newline character, single quotation mark, or certain other characters in a character constant, you must use escape sequences. An escape sequence is regarded as a single character and is therefore valid as a character constant.

In C# you can use the backslash to put special characters to your string. For example, to put ", you need to write \". There are a lot of characters that you write using the backslash: Backslash with a number:

• \000 null
• \010 backspace
• \011 horizontal tab
• \012 new line
• \015 carriage return
• \032 substitute
• \042 double quote
• \047 single quote
• \134 backslash
• \140 grave accent

Backslash with other character

• \' - single quote, needed for character literals
• \" - double quote, needed for string literals
• \\ – backslash
• \0 - Unicode character 0
• \a - Alert (character 7)
• \b - Backspace (character 8)
• \f - Form feed (character 12)
• \n - New line (character 10)
• \r - Carriage return (character 13)
• \t - Horizontal tab (character 9)
• \v - Vertical quote (character 11)
• \uxxxx - Unicode escape sequence for character with hex value xxxx
  \xn[n][n][n] - Unicode escape sequence for character with hex value nnnn (variable length version of \uxxxx)
• \Uxxxxxxxx - Unicode escape sequence for character with hex value xxxxxxxx (for generating surrogates

Hope this helps!!

How to get Cookies reference is getting in ashx file

Here is how you can do it if you set Cookies in different pages. Below code will help you get Cookies in ASHX file

  public void ProcessRequest(HttpContext context)
        {
            context.Response.AddHeader("Pragma", "no-cache");
            context.Response.AddHeader("Cache-Control", "private, no-cache");

            if (context.Request.Cookies["UserID"] != null && 
                context.Request.Cookies["UserID"].Value != null 
                && context.Request.Cookies["UserID"].Value.Trim() != "")
            {
                UserID = Convert.ToInt32(context.Request.Cookies["UserID"].Value);
            }

            HandleMethod(context);
        }

Hope this helps !!

How to access ViewState of one page in another page in Asp.Net?

You can't access ViewState of one page from another page directly. If you want to access a particular ViewState value then you can pass the value in Context collection and then access the value in other page.

In Page 1:

Context.Items.Add("employee" ,ViewState["employee"].ToString());

In Page 2:

string employeeName = Context.Items["employee"].ToString();

Hope this helps!

How to: Disable Button after Click while maintaining CausesValidation and an OnClick-Method

Here is how you can do it by adding these two lines in your code behind to prevent multiple clicks on a button.

string strProcessScript = "if (!Page_ClientValidate()){ return false; } else{ this.value='Processing...';this.disabled=true; }";
CheckOutButton.Attributes.Add("onclick", strProcessScript + ClientScript.GetPostBackEventReference(CheckOutButton, "").ToString());

If you have ASP.NET Validation controls in your page, then you might need to do this by adding specific validation group to Page_ClientValidate method.

string strProcessScript = "if (!Page_ClientValidate('PaymentValidationGroup')){ return false; } else{ this.value='Processing...';this.disabled=true; }";
CheckOutButton.Attributes.Add("onclick", strProcessScript + ClientScript.GetPostBackEventReference(CheckOutButton, "").ToString());

 

Only thing you need to change in ASPX is to add following attribute in ASP Button code UseSubmitBehavior="false"

 

<asp:Button runat="server" ID="PaymentCheckOutButton" ValidationGroup="PaymentValidationGroup"                                          
Text="Proceed to Checkout" UseSubmitBehavior="false" class="btn btn-primary btn-cons pull-right" OnClick="PaymentCheckOutButton_Click" />

 

Hope this helps!!

Happy New Year 2015

I wish you and your family a happy, healthy New Year. I hope that 2015 is a year of dreams fulfilled and happiness achieved. I hope all of us are able to meet the inevitable challenges and setbacks with heart and fortitude. May 2015 bring you all great happiness, health, and prosperity.

Thank you so much for being with me & thank you so much for your kindness & care.