diff --git a/VAR.ExpressionEvaluator.Tests/ParserTests.cs b/VAR.ExpressionEvaluator.Tests/ParserTests.cs
index c142532..31d59af 100644
--- a/VAR.ExpressionEvaluator.Tests/ParserTests.cs
+++ b/VAR.ExpressionEvaluator.Tests/ParserTests.cs
@@ -864,6 +864,17 @@ namespace VAR.ExpressionEvaluator.Tests
             Assert.False((bool?)result);
         }
 
+        [Fact()]
+        public void Misc__ProductWithStringDecimals_EqualsFalse()
+        {
+            EvaluationContext evaluationContex = new EvaluationContext();
+            evaluationContex.SetVariable("$1109", "1933");
+            evaluationContex.SetVariable("$1150", "02.00000");
+            string expression = "$1109 * $1150";
+            object result = Parser.EvaluateString(expression, evaluationContex);
+            Assert.Equal(3866.00000M, result);
+        }
+
         #endregion Misc
     }
 }
\ No newline at end of file
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionDivisionNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionDivisionNode.cs
index 62c04a3..68f93bf 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionDivisionNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionDivisionNode.cs
@@ -18,7 +18,7 @@ namespace VAR.ExpressionEvaluator
 
             if (leftValue is string)
             {
-                if (decimal.TryParse((string)leftValue, out decimal dec) == false)
+                if (decimal.TryParse((string)leftValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)leftValue));
                 }
@@ -26,7 +26,7 @@ namespace VAR.ExpressionEvaluator
             }
             if (rightValue is string)
             {
-                if (decimal.TryParse((string)rightValue, out decimal dec) == false)
+                if (decimal.TryParse((string)rightValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)rightValue));
                 }
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionEqualsNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionEqualsNode.cs
index f27c703..64ef60a 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionEqualsNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionEqualsNode.cs
@@ -44,7 +44,7 @@
             // Decimal
             if (leftValue is string)
             {
-                if (decimal.TryParse((string)leftValue, out decimal dec) == false)
+                if (decimal.TryParse((string)leftValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     leftValue = null;
                 }
@@ -55,7 +55,7 @@
             }
             if (rightValue is string)
             {
-                if (decimal.TryParse((string)rightValue, out decimal dec) == false)
+                if (decimal.TryParse((string)rightValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     rightValue = null;
                 }
@@ -85,7 +85,7 @@
                     return null;
                 }
                 decimal decValue;
-                if (decimal.TryParse(text, out decValue))
+                if (decimal.TryParse(text, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decValue))
                 {
                     return decValue != 0;
                 }
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionGreaterOrEqualThanNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionGreaterOrEqualThanNode.cs
index d538486..0c8b18a 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionGreaterOrEqualThanNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionGreaterOrEqualThanNode.cs
@@ -24,7 +24,7 @@ namespace VAR.ExpressionEvaluator
                 }
                 else
                 {
-                    if (decimal.TryParse((string)leftValue, out decimal dec) == false)
+                    if (decimal.TryParse((string)leftValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                     {
                         throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)leftValue));
                     }
@@ -39,7 +39,7 @@ namespace VAR.ExpressionEvaluator
                 }
                 else
                 {
-                    if (decimal.TryParse((string)rightValue, out decimal dec) == false)
+                    if (decimal.TryParse((string)rightValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                     {
                         throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)rightValue));
                     }
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionGreaterThanNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionGreaterThanNode.cs
index 02d1800..9470d41 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionGreaterThanNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionGreaterThanNode.cs
@@ -24,7 +24,7 @@ namespace VAR.ExpressionEvaluator
                 }
                 else
                 {
-                    if (decimal.TryParse((string)leftValue, out decimal dec) == false)
+                    if (decimal.TryParse((string)leftValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                     {
                         throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)leftValue));
                     }
@@ -39,7 +39,7 @@ namespace VAR.ExpressionEvaluator
                 }
                 else
                 {
-                    if (decimal.TryParse((string)rightValue, out decimal dec) == false)
+                    if (decimal.TryParse((string)rightValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                     {
                         throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)rightValue));
                     }
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionLessOrEqualThanNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionLessOrEqualThanNode.cs
index 703bedd..9a84087 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionLessOrEqualThanNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionLessOrEqualThanNode.cs
@@ -24,7 +24,7 @@ namespace VAR.ExpressionEvaluator
                 }
                 else
                 {
-                    if (decimal.TryParse((string)leftValue, out decimal dec) == false)
+                    if (decimal.TryParse((string)leftValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                     {
                         throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)leftValue));
                     }
@@ -39,7 +39,7 @@ namespace VAR.ExpressionEvaluator
                 }
                 else
                 {
-                    if (decimal.TryParse((string)rightValue, out decimal dec) == false)
+                    if (decimal.TryParse((string)rightValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                     {
                         throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)rightValue));
                     }
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionLessThanNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionLessThanNode.cs
index 37ea31b..c92ebf8 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionLessThanNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionLessThanNode.cs
@@ -24,7 +24,7 @@ namespace VAR.ExpressionEvaluator
                 }
                 else
                 {
-                    if (decimal.TryParse((string)leftValue, out decimal dec) == false)
+                    if (decimal.TryParse((string)leftValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                     {
                         throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)leftValue));
                     }
@@ -39,7 +39,7 @@ namespace VAR.ExpressionEvaluator
                 }
                 else
                 {
-                    if (decimal.TryParse((string)rightValue, out decimal dec) == false)
+                    if (decimal.TryParse((string)rightValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                     {
                         throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)rightValue));
                     }
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionMinusNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionMinusNode.cs
index 9264bcf..6b83697 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionMinusNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionMinusNode.cs
@@ -18,7 +18,7 @@ namespace VAR.ExpressionEvaluator
 
             if (leftValue is string)
             {
-                if (decimal.TryParse((string)leftValue, out decimal dec) == false)
+                if (decimal.TryParse((string)leftValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)leftValue));
                 }
@@ -26,7 +26,7 @@ namespace VAR.ExpressionEvaluator
             }
             if (rightValue is string)
             {
-                if (decimal.TryParse((string)rightValue, out decimal dec) == false)
+                if (decimal.TryParse((string)rightValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)rightValue));
                 }
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionMultiplyNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionMultiplyNode.cs
index b9dbb1f..af431c5 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionMultiplyNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionMultiplyNode.cs
@@ -18,7 +18,7 @@ namespace VAR.ExpressionEvaluator
 
             if (leftValue is string)
             {
-                if (decimal.TryParse((string)leftValue, out decimal dec) == false)
+                if (decimal.TryParse((string)leftValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)leftValue));
                 }
@@ -26,7 +26,7 @@ namespace VAR.ExpressionEvaluator
             }
             if (rightValue is string)
             {
-                if (decimal.TryParse((string)rightValue, out decimal dec) == false)
+                if (decimal.TryParse((string)rightValue, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)rightValue));
                 }
diff --git a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionNumberNegateNode.cs b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionNumberNegateNode.cs
index cd70aba..ae50713 100644
--- a/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionNumberNegateNode.cs
+++ b/VAR.ExpressionEvaluator/ExpressionNodes/ExpressionNumberNegateNode.cs
@@ -18,7 +18,7 @@ namespace VAR.ExpressionEvaluator
 
             if (value is string)
             {
-                if (decimal.TryParse((string)value, out decimal dec) == false)
+                if (decimal.TryParse((string)value, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out decimal dec) == false)
                 {
                     throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)value));
                 }
diff --git a/VAR.ExpressionEvaluator/Parser.cs b/VAR.ExpressionEvaluator/Parser.cs
index 055a089..c6744e5 100644
--- a/VAR.ExpressionEvaluator/Parser.cs
+++ b/VAR.ExpressionEvaluator/Parser.cs
@@ -32,7 +32,7 @@ namespace VAR.ExpressionEvaluator
 
         #region Creator
 
-        private ITokenizer _tokenizer;
+        private readonly ITokenizer _tokenizer;
 
         public Parser(ITokenizer tokenizer)
         {