diff --git a/core/emptystringvalidator.cpp b/core/emptystringvalidator.cpp
index 67e3926..f7a121d 100644
--- a/core/emptystringvalidator.cpp
+++ b/core/emptystringvalidator.cpp
@@ -1,7 +1,22 @@
 #include "emptystringvalidator.h"
 
-EmptyStringValidator::EmptyStringValidator()
+#include <QMetaObject>
+#include <QMetaProperty>
+
+EmptyStringValidator::EmptyStringValidator(QWidget *widget, const QString &errMessage)
+    :IValidator(widget, errMessage)
+{   
+}
+
+bool EmptyStringValidator::validate()
 {
+    QString data = m_widget->property(m_widget->metaObject()->userProperty().name()).toString();
+    if (data.isEmpty())
+    {
+        m_widget->setFocus();
+        return false;
+    }
 
+    return true;
 }
 
diff --git a/core/emptystringvalidator.h b/core/emptystringvalidator.h
index 887d0d7..c060f86 100644
--- a/core/emptystringvalidator.h
+++ b/core/emptystringvalidator.h
@@ -1,11 +1,17 @@
 #ifndef EMPTYSTRINGVALIDATOR_H
 #define EMPTYSTRINGVALIDATOR_H
 
+#include <QString>
+#include "ivalidator.h"
 
 class EmptyStringValidator : public IValidator
 {
 public:
-    EmptyStringValidator();
+    EmptyStringValidator(QWidget *widget, const QString &errMessage);
+
+    // IValidator interface
+public:
+    bool validate();
 };
 
 #endif // EMPTYSTRINGVALIDATOR_H
diff --git a/core/ivalidator.h b/core/ivalidator.h
index ebb945b..d096a7d 100644
--- a/core/ivalidator.h
+++ b/core/ivalidator.h
@@ -1,5 +1,31 @@
 #ifndef IVALIDATOR_H
 #define IVALIDATOR_H
 
+#include <QWidget>
+#include <QString>
+
+class IValidator
+{
+public:
+    IValidator(QWidget *widget, const QString &errMessage)
+    {
+        m_widget = widget;
+        m_errMessage = errMessage;
+    }
+
+    virtual bool validate() = 0;
+
+    QString errMessage()
+    {
+        return m_errMessage;
+    }
+
+protected:
+    QWidget *m_widget;
+
+private:
+    QString m_errMessage;
+};
+
 #endif // IVALIDATOR_H