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javascript validation to controls

<script type="text/javascript" language="javascript">
        function Validation()
        {
            var txt1=document.getElementById("<%=ddl_UserType.ClientID%>").selectedIndex;
            var txt2=document.getElementById("<%=txt_FirstName.ClientID%>").value;
            var txt3=document.getElementById("<%=txt_MiddleName.ClientID%>").value;
            var txt4=document.getElementById("<%=txt_LastName.ClientID%>").value;

            var txt6=document.getElementById("<%=txt_AdressOne.ClientID%>").value;

            var txt8=document.getElementById("<%=txt_City.ClientID%>").value;
            var txt9=document.getElementById("<%=ddl_State.ClientID%>").selectedIndex;           
            var txt10=document.getElementById("<%=ddl_Country.ClientID%>").selectedIndex;
            var txt11=document.getElementById("<%=txt_ZipCode.ClientID%>").value;
            var txt12=document.getElementById("<%=txt_Email.ClientID%>").value;
            var txt13=document.getElementById("<%=txt_PhoneNo.ClientID%>").value;
            var txt14=document.getElementById("<%=txt_CellNo.ClientID%>").value;
            var txt15=document.getElementById("<%=txt_WorkPhoneNo.ClientID%>").value;
            var txt16=document.getElementById("<%=txt_Password.ClientID%>").value;
            var txt17=document.getElementById("<%=txt_RetypePws.ClientID%>").value;
          
            if(txt1==0 || txt2=="" || txt3=="" || txt4==""  || txt6=="" ||  txt8=="" || txt9==0 || txt10==0 || txt11=="" || txt12=="" || txt13=="" || txt14=="" || txt15=="" || txt16=="" || txt17=="")
            {
                alert('All Fields Mandatory');
                return false;
            }
            if(txt1==0)
            {
                alert('Select User Type');
                return false;
            }


            var Exp1=/^[a-z-A-Z]+$/;
            var array1=txt2.match(Exp1);
            var array2=txt4.match(Exp1);
            if(array1==null ||array2==null)
            {
                alert('First Name and Last Name Should be Alphabets');
            
                return false;
            }
             var Exp2=/^[0-9+-]+$/;
            var array3=txt13.match(Exp2);
            if(array3==null)
            {
                alert('Phone Number Should be Digits');
                return false;
            }
          
              var Exp3=/^[0-9+-]+$/;
            var array4=txt14.match(Exp3);
            if(array4==null)
            {
                alert('Cell Number Should be Digits');
                return false;
            }
              var Exp4=/^[0-9+-]+$/;
            var array5=txt15.match(Exp4);
            if(array5==null)
            {
                alert('Work Phone Number Should be Digits');
                return false;
            }
          
             var Ok = confirm('Do u want to submit');
           if (Ok)
           {
           return true ;
           }
           else
           {
           return false;
           }

        }
         function Validation1()
        {
         var Ok = confirm('Do u want to update');
           if (Ok)
           {
           return true ;
           }
           else
           {
           return false;
           }
        }
      
      

  
    </script>

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