hi
更新:
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保留SNO的标签控件的ID为..."lblSno"
因此，从...更改代码.

hi
Update:
--------------
ID of label control that holds SNO is... "lblSno"
So change the code from...

int Sno = Convert.ToInt32((GridView1.Rows[e.RowIndex].FindControl("SNO") as Label).Text);

到

to

int Sno = Convert.ToInt32((GridView1.Rows[e.RowIndex].FindControl("lblSno") as Label).Text);

更好的代码将是..

better code will be..

int Sno = 0 ;
Label lblSno = GridView1.Rows[e.RowIndex].FindControl("lblSno") as Label
if (lblSno != null)
{
    int.TryParse(lblSno.Text, out Sno);
}

这样可以防止错误.

对于删除
---------------------

我认为您的单元格索引(即

This way you can prevent error.

For Delete
---------------------

I think your cell index (i.e

Cells[0]

)不正确. plesae检查以下行

希望对您有帮助

) is not right. plesae check the following line

Hope this will help you

string favoritesId = GridView1.Rows[e.RowIndex].Cells[0].Text;