Json ajax validation

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ASP

JSON.NET

In my project i'am passing text box value through json. When i put" <script> " as input value it now allows the value,but it will affect all my page design . i dont want to allow any tags. how can i do that.Will JSON.stringify works for this.if so how can i achieve.i also dont want to allow single quote,back slash.

function creList(){ 
 		var Name =$jq("#createew").val() ;
if(Name == "")
		{
  
	  $jq("#Err").dialog("option","modal",true).dialog("open");
		    $jq('#Err').css("min-height", '24px');
		    $jq('#Err').css("text-align", 'center');     
		    $jq('#Err').css("color", 'red');
		    $jq('#Err').text('Please  message');
		    $jq('#Err').css("font-size", '130%');
  
  
		}
		else
		{
			if( Name.indexOf('\'') > -1 || Name.indexOf('\\') > -1)
			{
			 Name=Name.replace(/'/g,'%27') ; 
		        Name=Name.replace(/\\/g,'%29');
		       }   
          $jq.ajax({ 
       	  type:"POST", 
	         url:"/pages.aspx/Create", 
	         data:"{liName:'" + Name + "' , pId: {PrId}}", 
	         contentType: "application/json; charset=utf-8", 
                dataType: "json", 
       	  success: onSuccess, 
	         error: onError 
	     }); 
		}