diff --git a/VAR.Focus.Web/Controls/CTextBox.cs b/VAR.Focus.Web/Controls/CTextBox.cs
index 2c0b78a..8dae99b 100644
--- a/VAR.Focus.Web/Controls/CTextBox.cs
+++ b/VAR.Focus.Web/Controls/CTextBox.cs
@@ -67,7 +67,7 @@ namespace VAR.Focus.Web.Controls
             CssClass = CssClassBase;
             if (string.IsNullOrEmpty(_cssClassExtra) == false)
             {
-                CssClass = String.Format("{0} {1}", CssClassBase, _cssClassExtra);
+                CssClass = string.Format("{0} {1}", CssClassBase, _cssClassExtra);
             }
             if (Page.IsPostBack && (_allowEmpty == false && IsEmpty()) || _markedInvalid)
             {
@@ -82,7 +82,7 @@ namespace VAR.Focus.Web.Controls
 
             if (_nextFocusOnEnter != null)
             {
-                this.Attributes.Add("onkeydown", String.Format(
+                this.Attributes.Add("onkeydown", string.Format(
                     "if(event.keyCode==13){{document.getElementById('{0}').focus(); return false;}}",
                     _nextFocusOnEnter.ClientID));
             }
diff --git a/VAR.Focus.Web/Pages/FrmBoard.cs b/VAR.Focus.Web/Pages/FrmBoard.cs
index 08087a2..4b26f84 100644
--- a/VAR.Focus.Web/Pages/FrmBoard.cs
+++ b/VAR.Focus.Web/Pages/FrmBoard.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Web;
 using System.Web.UI.WebControls;
 using VAR.Focus.BusinessLogic;
 using VAR.Focus.BusinessLogic.Entities;
@@ -29,7 +30,7 @@ namespace VAR.Focus.Web.Pages
         private void FrmBoard_Init(object sender, EventArgs e)
         {
             string strIDBoard = Context.GetRequestParm("idBoard");
-            if (String.IsNullOrEmpty(strIDBoard) == false)
+            if (string.IsNullOrEmpty(strIDBoard) == false)
             {
                 _idBoard = Convert.ToInt32(strIDBoard);
             }
@@ -134,7 +135,7 @@ namespace VAR.Focus.Web.Pages
             };
             btnDelete.CommandArgument = Convert.ToString(board.IDBoard);
             btnDelete.Click += BtnDelete_Click;
-            btnDelete.Attributes.Add("onclick", String.Format("return confirm('{0}');", "¿Are you sure to delete?"));
+            btnDelete.Attributes.Add("onclick", string.Format("return confirm('{0}');", "¿Are you sure to delete?"));
             pnlButtons.Controls.Add(btnDelete);
             pnlBoardSelector.Controls.Add(pnlButtons);
 
diff --git a/VAR.Focus.Web/Pages/FrmBoardEdit.cs b/VAR.Focus.Web/Pages/FrmBoardEdit.cs
index c38e057..f1802cf 100644
--- a/VAR.Focus.Web/Pages/FrmBoardEdit.cs
+++ b/VAR.Focus.Web/Pages/FrmBoardEdit.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Web;
 using System.Web.UI.WebControls;
 using VAR.Focus.BusinessLogic;
 using VAR.Focus.BusinessLogic.Entities;
@@ -39,7 +40,7 @@ namespace VAR.Focus.Web.Pages
         private void FrmBoardEdit_Init(object sender, EventArgs e)
         {
             string strIDBoard = Context.GetRequestParm("idBoard");
-            if (String.IsNullOrEmpty(strIDBoard) == false)
+            if (string.IsNullOrEmpty(strIDBoard) == false)
             {
                 _idBoard = Convert.ToInt32(strIDBoard);
             }
@@ -102,7 +103,7 @@ namespace VAR.Focus.Web.Pages
             Panel pnlButtons = new Panel();
             pnlButtons.Controls.Add(_btnSave);
             pnlButtons.Controls.Add(_btnExit);
-            Controls.Add(FormUtils.CreateField(String.Empty, pnlButtons));
+            Controls.Add(FormUtils.CreateField(string.Empty, pnlButtons));
         }
 
         private void LoadData()
diff --git a/VAR.Focus.Web/Pages/FrmError.cs b/VAR.Focus.Web/Pages/FrmError.cs
index 09eb6dd..ea35e72 100644
--- a/VAR.Focus.Web/Pages/FrmError.cs
+++ b/VAR.Focus.Web/Pages/FrmError.cs
@@ -43,17 +43,17 @@ namespace VAR.Focus.Web.Pages
             while (exAux != null)
             {
                 CLabel lblMessage = new CLabel { Tag = "P" };
-                lblMessage.Text = String.Format("<b>{0}:</b> {1}", "Message", HttpUtility.HtmlEncode(exAux.Message));
+                lblMessage.Text = string.Format("<b>{0}:</b> {1}", "Message", HttpUtility.HtmlEncode(exAux.Message));
                 Controls.Add(lblMessage);
 
                 CLabel lblStacktraceTitle = new CLabel { Tag = "p" };
-                lblStacktraceTitle.Text = String.Format("<b>{0}:</b>", "Stacktrace");
+                lblStacktraceTitle.Text = string.Format("<b>{0}:</b>", "Stacktrace");
                 Controls.Add(lblStacktraceTitle);
                 Panel pnlStacktrace = new Panel();
                 pnlStacktrace.CssClass = "divCode";
                 Controls.Add(pnlStacktrace);
                 LiteralControl litStackTrace = new LiteralControl(
-                    String.Format("<pre><code>{0}</code></pre>", HttpUtility.HtmlEncode(exAux.StackTrace)));
+                    string.Format("<pre><code>{0}</code></pre>", HttpUtility.HtmlEncode(exAux.StackTrace)));
                 pnlStacktrace.Controls.Add(litStackTrace);
 
                 exAux = exAux.InnerException;
diff --git a/VAR.Focus.Web/Pages/FrmLogin.cs b/VAR.Focus.Web/Pages/FrmLogin.cs
index 0d0f963..259d9a7 100644
--- a/VAR.Focus.Web/Pages/FrmLogin.cs
+++ b/VAR.Focus.Web/Pages/FrmLogin.cs
@@ -65,11 +65,11 @@ namespace VAR.Focus.Web.Pages
             _txtPassword.NextFocusOnEnter = _btnLogin;
             _txtPassword.PlaceHolder = "Password";
 
-            Controls.Add(FormUtils.CreateField(String.Empty, _btnLogin));
+            Controls.Add(FormUtils.CreateField(string.Empty, _btnLogin));
             _btnLogin.Text = "Login";
             _btnLogin.Click += btnLogin_Click;
 
-            Controls.Add(FormUtils.CreateField(String.Empty, new HyperLink { Text = "Register user", NavigateUrl = "FrmRegister" }));
+            Controls.Add(FormUtils.CreateField(string.Empty, new HyperLink { Text = "Register user", NavigateUrl = "FrmRegister" }));
         }
 
         #endregion Private methods
diff --git a/VAR.Focus.Web/Pages/FrmRegister.cs b/VAR.Focus.Web/Pages/FrmRegister.cs
index 5c70f8c..ffb7cf7 100644
--- a/VAR.Focus.Web/Pages/FrmRegister.cs
+++ b/VAR.Focus.Web/Pages/FrmRegister.cs
@@ -51,8 +51,8 @@ namespace VAR.Focus.Web.Pages
             {
                 _txtPassword1.MarkedInvalid = true;
                 _txtPassword2.MarkedInvalid = true;
-                _txtPassword1.Text = String.Empty;
-                _txtPassword2.Text = String.Empty;
+                _txtPassword1.Text = string.Empty;
+                _txtPassword2.Text = string.Empty;
                 return;
             }
 
@@ -60,7 +60,7 @@ namespace VAR.Focus.Web.Pages
 
             _pnlRegister.Visible = false;
             _pnlSuccess.Visible = true;
-            _lblSuccess.Text = String.Format("User {0} created sucessfully", user.Name);
+            _lblSuccess.Text = string.Format("User {0} created sucessfully", user.Name);
         }
 
         private void btnExit_Click(object sender, EventArgs e)
@@ -92,7 +92,7 @@ namespace VAR.Focus.Web.Pages
             _txtPassword1.NextFocusOnEnter = _txtPassword2;
             _txtPassword1.PlaceHolder = "Password";
 
-            _pnlRegister.Controls.Add(FormUtils.CreateField(String.Empty, _txtPassword2));
+            _pnlRegister.Controls.Add(FormUtils.CreateField(string.Empty, _txtPassword2));
             _txtPassword2.NextFocusOnEnter = _btnRegister;
             _txtPassword2.PlaceHolder = "Password";
 
@@ -105,7 +105,7 @@ namespace VAR.Focus.Web.Pages
             Panel pnlButtons = new Panel();
             pnlButtons.Controls.Add(_btnRegister);
             pnlButtons.Controls.Add(_btnExit);
-            _pnlRegister.Controls.Add(FormUtils.CreateField(String.Empty, pnlButtons));
+            _pnlRegister.Controls.Add(FormUtils.CreateField(string.Empty, pnlButtons));
 
             Controls.Add(_pnlSuccess);
             _pnlSuccess.Visible = false;
@@ -114,7 +114,7 @@ namespace VAR.Focus.Web.Pages
 
             _btnExitSuccess.Text = "Exit";
             _btnExitSuccess.Click += btnExit_Click;
-            _pnlSuccess.Controls.Add(FormUtils.CreateField(String.Empty, _btnExitSuccess));
+            _pnlSuccess.Controls.Add(FormUtils.CreateField(string.Empty, _btnExitSuccess));
         }
 
         #endregion Private methods
diff --git a/VAR.Focus.Web/Pages/PageCommon.cs b/VAR.Focus.Web/Pages/PageCommon.cs
index b833993..005729e 100644
--- a/VAR.Focus.Web/Pages/PageCommon.cs
+++ b/VAR.Focus.Web/Pages/PageCommon.cs
@@ -80,7 +80,7 @@ namespace VAR.Focus.Web.Pages
 
         private void PageCommon_PreRender(object sender, EventArgs e)
         {
-            _head.Title = string.IsNullOrEmpty(Title) ? Globals.Title : String.Format("{0}{1}{2}", Title, Globals.TitleSeparator, Globals.Title);
+            _head.Title = string.IsNullOrEmpty(Title) ? Globals.Title : string.Format("{0}{1}{2}", Title, Globals.TitleSeparator, Globals.Title);
             _btnLogout.Visible = (_currentUser != null);
         }
 
@@ -122,8 +122,8 @@ namespace VAR.Focus.Web.Pages
             _head.Controls.Add(new HtmlMeta { Name = "viewport", Content = "width=device-width, initial-scale=1, maximum-scale=4, user-scalable=1" });
 
             string version = Assembly.GetExecutingAssembly().GetName().Version.ToString();
-            _head.Controls.Add(new LiteralControl(String.Format("<script type=\"text/javascript\" src=\"ScriptsBundler?v={0}\"></script>\n", version)));
-            _head.Controls.Add(new LiteralControl(String.Format("<link href=\"StylesBundler?v={0}\" type=\"text/css\" rel=\"stylesheet\"/>\n", version)));
+            _head.Controls.Add(new LiteralControl(string.Format("<script type=\"text/javascript\" src=\"ScriptsBundler?v={0}\"></script>\n", version)));
+            _head.Controls.Add(new LiteralControl(string.Format("<link href=\"StylesBundler?v={0}\" type=\"text/css\" rel=\"stylesheet\"/>\n", version)));
 
             _body = new HtmlGenericControl("body");
             html.Controls.Add(_body);
@@ -151,7 +151,7 @@ namespace VAR.Focus.Web.Pages
             _btnLogout.ID = "btnLogout";
             _btnLogout.Text = "Logout";
             _btnLogout.Click += btnLogout_Click;
-            _btnLogout.Attributes.Add("onclick", String.Format("return confirm('{0}');", "¿Are you sure to exit?"));
+            _btnLogout.Attributes.Add("onclick", string.Format("return confirm('{0}');", "¿Are you sure to exit?"));
             pnlUserInfo.Controls.Add(_btnLogout);
 
             _pnlContainer.CssClass = "divContent";