diff --git a/ClosedXML/Excel/CustomProperties/XLCustomProperty.cs b/ClosedXML/Excel/CustomProperties/XLCustomProperty.cs
index d814355..a1d4d19 100644
--- a/ClosedXML/Excel/CustomProperties/XLCustomProperty.cs
+++ b/ClosedXML/Excel/CustomProperties/XLCustomProperty.cs
@@ -21,6 +21,8 @@
             get { return name; }
             set
             {
+                if (name == value) return;
+
                 if (_workbook.CustomProperties.Any(t => t.Name == value))
                     throw new ArgumentException(
                         String.Format("This workbook already contains a custom property named '{0}'", value));
diff --git a/ClosedXML/Excel/Tables/XLTableField.cs b/ClosedXML/Excel/Tables/XLTableField.cs
index 9b6ee39..15a2a89 100644
--- a/ClosedXML/Excel/Tables/XLTableField.cs
+++ b/ClosedXML/Excel/Tables/XLTableField.cs
@@ -53,6 +53,8 @@
             }
             set
             {
+                if (name == value) return;
+
                 if (table.ShowHeaderRow)
                     (table.HeadersRow(false).Cell(Index + 1) as XLCell).SetValue(value, false);
 
diff --git a/ClosedXML/Excel/XLWorksheet.cs b/ClosedXML/Excel/XLWorksheet.cs
index 6be26bb..01c1007 100644
--- a/ClosedXML/Excel/XLWorksheet.cs
+++ b/ClosedXML/Excel/XLWorksheet.cs
@@ -171,6 +171,8 @@
             get { return _name; }
             set
             {
+                if (_name == value) return;
+
                 if (String.IsNullOrWhiteSpace(value))
                     throw new ArgumentException("Worksheet names cannot be empty");