How to set the Gridview Header Text Center Aligned

There are couple of ways to doing the same, the easiest & simplest way is just add the following line of code.

<HeaderStyle HorizontalAlign="Center" />

Ok so Apply the second technique. Its a CSS based tech.

.GridHeader
{
    text-align:center !important;    
}

Create a Css class like one above. and than set CssClass of your header as in the grid views tag like.

<asp:GridView ID="GridView1" runat="server" HeaderStyle-CssClass="GridHeader">