Merge pull request #2 from RavikumarAkuthotaSf4250/master

Update README.md file

Author: Lakshminatarajan

README.md

@@ -1,2 +1,77 @@
 # disable-send-icon-when-editor-text-reaches-certain-length-xamarin.forms-chat
-How to disable the send icon when the editor text reaches a certain length in Xamarin.Forms Chat (SfChat) ?
+This sample demonstrates how to disable the send icon when the editor text reaches a certain length in Xamarin.Forms Chat (SfChat).
+
+## Sample
+
+```xaml
+
+    <ContentPage.Content>
+        <sfChat:SfChat x:Name="sfChat"
+                       Messages="{Binding Messages}"
+                       CurrentUser="{Binding CurrentUser}"   
+                       ShowIncomingMessageAvatar="True"
+                       ShowOutgoingMessageAvatar="True">
+            <sfChat:SfChat.Behaviors>
+                <local:SfChatBehavior/>
+            </sfChat:SfChat.Behaviors>
+        </sfChat:SfChat>
+    </ContentPage.Content
+
+Behavior:
+
+    public class SfChatBehavior : Behavior<SfChat>
+    {
+        #region Fields
+
+        private SfChat sfChat = null;
+
+        #endregion
+
+        #region Overrides
+
+        protected override void OnAttachedTo(SfChat bindable)
+        {
+            base.OnAttachedTo(bindable);
+            sfChat = bindable;
+            if (sfChat != null)
+            {
+                sfChat.Editor.TextChanged += Editor_TextChanged;
+            }
+        }
+
+        protected override void OnDetachingFrom(SfChat bindable)
+        {
+            base.OnAttachedTo(bindable);
+            sfChat.Editor.TextChanged -= Editor_TextChanged;
+            sfChat = null;
+           
+        }
+
+        #endregion
+
+        private void Editor_TextChanged(object sender, TextChangedEventArgs e)
+        {
+            var editorGrid = this.sfChat.GetType().GetRuntimeProperties().FirstOrDefault(x => x.Name == "FooterView").GetValue(this.sfChat) as Grid;
+            var inputView = editorGrid.Children.FirstOrDefault(x => x.GetType() == typeof(MessageInputView)) as MessageInputView;
+            var border = (inputView as ContentView).Content;
+            var grid = (border as ContentView).Content as Grid;
+            if ((sender as Editor).Text.Length >= 40)
+            {
+                (grid.Children[2] as SendMessageView).IsVisible = false;
+            }
+            else
+                ((grid.Children[2] as SendMessageView)).IsVisible = true;
+        }
+    }
+
+```
+
+## Requirements to run the demo
+
+To run the demo, refer to [System Requirements for Xamarin](https://help.syncfusion.com/xamarin/system-requirements)
+
+## Troubleshooting
+
+### Path too long exception
+
+If you are facing path too long exception when building this example project, close Visual Studio and rename the repository to short and build the project.