diff --git a/RfidWeb/Frm/UserAlarmShow.cs b/RfidWeb/Frm/UserAlarmShow.cs
index fa85f21..b3da3b1 100644
--- a/RfidWeb/Frm/UserAlarmShow.cs
+++ b/RfidWeb/Frm/UserAlarmShow.cs
@@ -74,11 +74,19 @@ namespace RfidWeb.Frm
             }
             this.Invoke(() =>
             {
-                int currentFirstVisibleRowIndex = dataGridView1.FirstDisplayedScrollingRowIndex;
-                this.dataGridView1.DataSource = lsList;
-                if (currentFirstVisibleRowIndex >=0 && currentFirstVisibleRowIndex < dataGridView1.Rows.Count)
+                try
                 {
-                    dataGridView1.FirstDisplayedScrollingRowIndex = currentFirstVisibleRowIndex;
+                    int currentFirstVisibleRowIndex = dataGridView1.FirstDisplayedScrollingRowIndex;
+                    this.dataGridView1.DataSource = lsList;
+                    if (currentFirstVisibleRowIndex >= 0 && currentFirstVisibleRowIndex < dataGridView1.Rows.Count)
+                    {
+                        dataGridView1.FirstDisplayedScrollingRowIndex = currentFirstVisibleRowIndex;
+                    }
+                }
+                catch (Exception e)
+                {
+                    Console.WriteLine(e);
+                    
                 }
             });
         }
@@ -99,11 +107,18 @@ namespace RfidWeb.Frm
             }
             this.Invoke(() =>
             {
-                int currentFirstVisibleRowIndex = dataGridView2.FirstDisplayedScrollingRowIndex;
-                this.dataGridView2.DataSource = lsList;
-                if (currentFirstVisibleRowIndex >= 0 && currentFirstVisibleRowIndex < dataGridView2.Rows.Count)
+                try
+                {
+                    int currentFirstVisibleRowIndex = dataGridView2.FirstDisplayedScrollingRowIndex;
+                    this.dataGridView2.DataSource = lsList;
+                    if (currentFirstVisibleRowIndex >= 0 && currentFirstVisibleRowIndex < dataGridView2.Rows.Count)
+                    {
+                        dataGridView2.FirstDisplayedScrollingRowIndex = currentFirstVisibleRowIndex;
+                    }
+                }
+                catch (Exception e)
                 {
-                    dataGridView2.FirstDisplayedScrollingRowIndex = currentFirstVisibleRowIndex;
+                   Console.WriteLine(e.Message);
                 }
             });
         }