Adding validation input: Doesn't accept non int and set maximum size of the board

.idea/.idea.IDoMinesweeper/.idea/workspace.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="a128ca0c-796d-4da2-8db0-062a4837d105" name="Default Changelist" comment="" />
+    <list default="true" id="a128ca0c-796d-4da2-8db0-062a4837d105" name="Default Changelist" comment="">
+      <change beforePath="$PROJECT_DIR$/.idea/.idea.IDoMinesweeper/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/.idea.IDoMinesweeper/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/IDoMinesweeper/Program.cs" beforeDir="false" afterPath="$PROJECT_DIR$/IDoMinesweeper/Program.cs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/IDoMinesweeper/bin/Debug/netcoreapp3.0/IDoMinesweeper.dll" beforeDir="false" afterPath="$PROJECT_DIR$/IDoMinesweeper/bin/Debug/netcoreapp3.0/IDoMinesweeper.dll" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/IDoMinesweeper/bin/Debug/netcoreapp3.0/IDoMinesweeper.pdb" beforeDir="false" afterPath="$PROJECT_DIR$/IDoMinesweeper/bin/Debug/netcoreapp3.0/IDoMinesweeper.pdb" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/IDoMinesweeper/obj/Debug/netcoreapp3.0/IDoMinesweeper.csprojAssemblyReference.cache" beforeDir="false" afterPath="$PROJECT_DIR$/IDoMinesweeper/obj/Debug/netcoreapp3.0/IDoMinesweeper.csprojAssemblyReference.cache" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/IDoMinesweeper/obj/Debug/netcoreapp3.0/IDoMinesweeper.dll" beforeDir="false" afterPath="$PROJECT_DIR$/IDoMinesweeper/obj/Debug/netcoreapp3.0/IDoMinesweeper.dll" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/IDoMinesweeper/obj/Debug/netcoreapp3.0/IDoMinesweeper.pdb" beforeDir="false" afterPath="$PROJECT_DIR$/IDoMinesweeper/obj/Debug/netcoreapp3.0/IDoMinesweeper.pdb" afterDir="false" />
+    </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -32,8 +40,8 @@
         <option value="$PROJECT_DIR$/Game/CellState.cs" />
         <option value="$PROJECT_DIR$/ConsoleUserInt/GameUI.cs" />
         <option value="$PROJECT_DIR$/Game/Engine.cs" />
-        <option value="$PROJECT_DIR$/IDoMinesweeper/Program.cs" />
         <option value="$PROJECT_DIR$/MenuSystem/Menu.cs" />
+        <option value="$PROJECT_DIR$/IDoMinesweeper/Program.cs" />
       </list>
     </option>
   </component>
@@ -96,8 +104,16 @@
       <workItem from="1570541467008" duration="1357000" />
       <workItem from="1570543449378" duration="28421000" />
       <workItem from="1570828559519" duration="1080000" />
-      <workItem from="1570969640551" duration="272000" />
+      <workItem from="1570969640551" duration="1737000" />
+    </task>
+    <task id="LOCAL-00001" summary="yes">
+      <created>1570973690674</created>
+      <option name="number" value="00001" />
+      <option name="presentableId" value="LOCAL-00001" />
+      <option name="project" value="LOCAL" />
+      <updated>1570973690675</updated>
     </task>
+    <option name="localTasksCounter" value="2" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -118,6 +134,8 @@
   </component>
   <component name="VcsManagerConfiguration">
     <option name="LOCAL_CHANGES_DETAILS_PREVIEW_SHOWN" value="true" />
+    <MESSAGE value="yes" />
+    <option name="LAST_COMMIT_MESSAGE" value="yes" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>

IDoMinesweeper/Program.cs

@@ -83,21 +83,57 @@ namespace IDoMinesweeper
                 
                 WriteLine("Board height (Min. 8): ");
                 WriteLine(">");
+                var checkHeight = ReadLine();
+                int height = 0;
+                if (!int.TryParse(checkHeight, out height))
+                {
+                    Console.WriteLine("Not an integer");
+                }
+
+                else
+                { 
+                    
+                    height = Convert.ToInt32(checkHeight);
+                }
+                
+
+                
                 
-                int height = Convert.ToInt32(ReadLine());
                
                 
                 WriteLine("Board width (Min. 8): ");
                 WriteLine(">");
-                var width = Convert.ToInt32(ReadLine());
+                
+                
+                var checkWidth = ReadLine();
+                int width = 0;
+                if (!int.TryParse(checkHeight, out height))
+                {
+                    Console.WriteLine("Not an integer");
+                }
+                else
+                {
+                    width = Convert.ToInt32(checkWidth);
+                }
+                //var width = Convert.ToInt32(ReadLine());
                 var doIt = false;
+                
                 do
                 {
                     
                 
                     if (height < 8  || width < 8)
                     {
-                        Console.WriteLine("Too small");
+                        Console.WriteLine("Too small. Minimal is 8x8");
+                        return "";
+                        break;
+                        
+                    }
+                    
+                    else if(height > 30  || width  > 30)
+
+                    {
+                        Console.WriteLine("Too big. Maximum size is 30x30");
                         return "";
                         break;
                     }