Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingCalculationsView.cs
===================================================================
diff -u -rcda9bb0707f49cfb8e685d3ec04da01240c73f26 -r65fbb105db0ceec852fbf97a568cec6f8c634809
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingCalculationsView.cs	(.../PipingCalculationsView.cs)	(revision cda9bb0707f49cfb8e685d3ec04da01240c73f26)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/Views/PipingCalculationsView.cs	(.../PipingCalculationsView.cs)	(revision 65fbb105db0ceec852fbf97a568cec6f8c634809)
@@ -165,6 +165,8 @@
         {
             dataGridView.CurrentCellDirtyStateChanged += DataGridViewCurrentCellDirtyStateChanged;
             dataGridView.CellClick += DataGridViewOnCellClick;
+            dataGridView.CellValidating += DataGridViewCellValidating;
+            dataGridView.DataError += DataGridViewDataError;
 
             var nameColumn = new DataGridViewTextBoxColumn
             {
@@ -693,6 +695,28 @@
             UpdateApplicationSelection();
         }
 
+        private void DataGridViewCellValidating(object sender, DataGridViewCellValidatingEventArgs e)
+        {
+            dataGridView.Rows[e.RowIndex].ErrorText = String.Empty;
+
+            var cellEditValue = e.FormattedValue.ToString();
+            if (string.IsNullOrWhiteSpace(cellEditValue))
+            {
+                dataGridView.Rows[e.RowIndex].ErrorText = Resources.DataGridViewCellValidating_Text_may_not_be_empty;
+            }
+        }
+
+        private void DataGridViewDataError(object sender, DataGridViewDataErrorEventArgs e)
+        {
+            e.ThrowException = false;
+            e.Cancel = true;
+
+            if (string.IsNullOrWhiteSpace(dataGridView.Rows[e.RowIndex].ErrorText) && e.Exception != null)
+            {
+                dataGridView.Rows[e.RowIndex].ErrorText = e.Exception.Message;
+            }
+        }
+
         private void ListBoxOnSelectedValueChanged(object sender, EventArgs e)
         {
             UpdateDataGridViewDataSource();