try like this..
<asp:GridView id="girdview" runat="server" AutoGenerateColumns="false" OnRowDataBound="girdview_RowDataBound">
<Columns>
<asp:BoundField DataField="Status" HeaderText="Status" />
<asp:BoundField DataField="others" HeaderText="others" />
</Columns>
</asp:GridView>
protected void girdview_RowDataBound(object sender, GridViewRowEventArgs e)
{
int statuscolumnIndex = 0;
if (e.Row.RowType == DataControlRowType.DataRow)
{
string status = DataBinder.Eval(e.Row.DataItem, "Status").ToString();
if (status == "Unactive")
e.Row.Cells[statuscolumnIndex].Style["background-color"] = "Red";
}
}