You can see the Row Header in my testing form application
Programmatically, you can do that by adding following code segment to InitializeComponent() method in Form1.Designer.cs class( In my case)
this.dataGridView1.RowHeadersVisible = false;
On the other hand, you can also select the DatagridView and Right click on it then click on Properties
Change the property of RowHeadersVisible into False in Properties Window.
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