GridView中HyperLinkFields中多参数问题

[Keven02]

各位大侠,在GridView中HyperLinkFields中怎么添加程序中的变量.
<asp:HyperLinkField DataTextField="KEYWORD" HeaderText="检索号"
SortExpression="KEYWORD" Target="_blank" HeaderStyle-Width="10%"
HeaderStyle-HorizontalAlign="Center"
DataNavigateUrlFields="PRJ,KEYWORD"
DataNavigateUrlFormatString="Contend.aspx?PRJ={0}&KEYWORD={1}">
<HeaderStyle HorizontalAlign="Center" Width="10%"></HeaderStyle>
</asp:HyperLinkField>


PRJ 程序中的变量

[wuyq11]

protected void GridView1_RowDataBound(object sender,GridViewRowEventArgs e)
{
HyperLink tmp=e.ROW.Cells[0].Controls[0] as HyperLink;
tmp.NavigateUrl="Contend.aspx?PRJ=变量1&KEYWORD=变量2";
}

[蝶恋花雨]

public string aa;
DataNavigateUrlFormatString="Contend.aspx?PRJ={<%=aa%>}&KEYWORD={1}"

[gengwanshanreally]

<asp:HyperLinkField HeaderText="编号" DataTextField="Id" NavigateUrl="~/USO.aspx" />