ASP.NET Interview Questions and Answers (1544) - Page 70

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How to disable Mouse right click on web page?

Simply give oncontextmenu event of Body tag to false will disable Mouse right click on entire web page as:-

<body oncontextmenu = "return false;">  

</body>

How to enforce Maximum character length Validation or how to allow maximum of 5 letters?

We will use Asp.net RegularExpressionValidator control to achieve this task:-

Refer below code:-

<asp:TextBox Id = "txt_employee_code" runat = "server"></asp:TextBox>



<asp:RegularExpressionValidator Display = "Dynamic" ControlToValidate = "txt_employee_code" Id = "reg_ex_employee_code" ValidationExpression = "^[\s\S]{0,5}$" runat = "server" ErrorMessage = "Maximum of 5 letters allowed"></asp:RegularExpressionValidator>

It will allow only 5 letters after that it will give error mmessage as Maximum of 5 letters allowed

How to enforce Minimum character length Validation or how to allow Minimum of 4 letters?

We will use Asp.net RegularExpressionValidator control to achieve this task:-

Refer below code:-

<asp:TextBox Id = "txt_employee_code" runat = "server"></asp:TextBox>



<asp:RegularExpressionValidator Display = "Dynamic" ControlToValidate = "txt_employee_code" Id = "reg_ex_employee_code" ValidationExpression = "^[\s\S]{4,}$" runat = "server" ErrorMessage = "Minimum of 4 letters allowed only"></asp:RegularExpressionValidator>

How to allow Minimum of 5 and Maximum of 7 letters in a Textbox?

We will write below code:-

<asp:TextBox Id = "txt_employee_code" runat = "server"></asp:TextBox>



<asp:RegularExpressionValidator Display = "Dynamic" ControlToValidate = "txt_employee_code" Id = "reg_ex_employee_code" ValidationExpression = "^[\s\S]{5,7}$" runat = "server" ErrorMessage = 



"Minimum of 5 and Maximum of 7 letters allowed only"></asp:RegularExpressionValidator>

How to disable Enter key pressed inside TextBox to avoid submission or postback in Asp.Net?

In textbox definition,we have to write below code on onkeydown event as:-

<asp:TextBox ID="txt_emp_first_name" runat="server" onkeydown = "return(event.keyCode!=13);"></asp:TextBox>

Here,13 is keyboard Enter button key code.
When enter key is pressed the above condition is false hence false is returned therefore the postback will be disabled.

How to disable Enter key pressed inside TextBox to avoid submission or postback through code behind?

Visual Studio gives us a warning message when we add onkeydown event.But it's just a warning so we can ignore.So to avoid this warning,we can also disable submission from code behind as:-

txt_emp_first_name.Attributes.Add("onkeydown","return (event.keyCode!=13);");

//OR

txt_emp_first_name.Attributes.Add("onkeydown","prevent_submission();");

Abobe return code should be written inside prevent_submission() js function.

How to disable the Enter key pressed form post-back for all page controls?

Simply add below code in the body tag as:

<body onkeydown = "return (event.keyCode!=13);">

Then it will be disabled for all controls on the page.