Update README.md

Author: Arulpriya

README.md

@@ -1,2 +1,26 @@
 # how-to-change-the-image-in-gridimagecolumn-after-mouse-hover-in-winforms-datagrid
-How to change the image in GridImageColumn after mouse hover in WinForms DataGrid (SfDataGrid)?
+By default, the Tooltip for grid cells will be loaded with CellValue. To add image in tooltip, the ToolTipOpening event can be used. In that event, the ToolTipInfo for the items can be updated with image.
+
+```//Event subscription
+this.sfDataGrid1.ToolTipOpening += SfDataGrid1_ToolTipOpening;
+
+//Event customization
+private void SfDataGrid1_ToolTipOpening(object sender, ToolTipOpeningEventArgs e)
+{
+    var record = e.Record as OrderInfo;
+
+    e.ToolTipInfo.Items.AddRange(new ToolTipItem[] { toolTipItem1, toolTipItem2 });
+
+    var recordIndex = this.sfDataGrid1.TableControl.ResolveToRowIndex(record);
+
+    if (e.RowIndex == recordIndex)
+    {
+        if (record.CustomerID == "FRANS")
+        {
+          e.ToolTipInfo.Items[1].Text = "FRANS";                        
+          e.ToolTipInfo.Items[0].Image = Image.FromFile(@"../../Images/FRANS.png");
+          }
+    }
+}
+```
+![Image in tooltip](Image%20in%20tooltip.png)