Can't Find Row Index In Datagridview?

Feb 12, 2010

I have a Datagrid in image below. [URL] I can't find row Index in Datagridview when I call a event in DropDownList.

protected void DescriptionOfProduct_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList _DescriptionOfProduct = (DropDownList)gvSales.FindControl("DescriptionOfProduct");
Label _Unit = (Label)gvSales.FindControl("Unit");
Label _PriceType = (Label)gvSales.FindControl("PriceType");
//...
}

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