Is there any way that I can get angular variable value as below syntax.?
var iNumber= "$scope.RegionLineNumber"
why you want to do this. If you want to get in string format then you can use $scope.RegionLineNumber.toString();
You can use eval (read this and this before)
var iNumber = eval("$scope.RegionLineNumber");
however there's certainly a better way to do that. For example, if you know it's in $scope, just use
$scope
var iNumber = $scope["RegionLineNumber"];