您已更改页脚行的可见性，
GridView1.FooterRow.Visible = true;

You have change the visibility of footer row,
GridView1.FooterRow.Visible = true;

U可以尝试这种方式...

U Can Try This Aslo...

Go GridView Property

Set "ShowFooter" property to true

哦，是的，谢谢我的朋友们

问候
迪帕克

ohhhh yes thanks my friends

Regards
Deepak