Small fix with reading the binary file

It's always a good idea to actually close a file after you read one :)

STM32 Flash Loader/MainForm.cs

@@ -92,6 +92,8 @@ private async void bWrite_Click(object sender, EventArgs e)
                 bin = new byte[s.Length];
                 /* read file contents */
                 await s.ReadAsync(bin, 0, bin.Length);
+                /* close file */
+                s.Close();
             /* error during read? */
             } catch (Exception) {
                 /* set message */
@@ -140,8 +142,11 @@ await stb.WriteMemory(address, bin, 0, bin.Length, p,
             } finally {
                 /* close port */
                 stb.Close();
+
                 /* re-enable button */
                 bWrite.Enabled = true;
+                /* set focus */
+                bWrite.Focus();
             }
         }
 
@@ -167,16 +172,6 @@ private void cbBauds_SelectedIndexChanged(object sender, EventArgs e)
             baudRate = uint.Parse((string)cbBauds.SelectedItem);
         }
 
-        /* set focus if button was enabled */
-        private void bWrite_EnabledChanged(object sender, EventArgs e)
-        {
-            /* button was enabled?*/
-            if (bWrite.Enabled) {
-                /* set focus */
-                bWrite.Focus();
-            }
-        }
-
         /* parse address */
         private void tbAddress_Leave(object sender, EventArgs e)
         {
@@ -240,7 +235,8 @@ private void UpdateStatus(bool ding, string text)
 
         private void cbPorts_KeyDown(object sender, KeyEventArgs e)
         {
-            cbPorts.DroppedDown = true;
+
+            //cbPorts.DroppedDown = true;
         }
     }
 }