Does not contain a definition for 'rowindex'

[taree]

I get Does not contain a definition for 'rowindex' error.any clue will be appreciated.

protected void btnConAd_Click(object sender, EventArgs e)
        {
            string valStr;
            foreach (GridView gvRows in gvConAd.Rows)
            {

                CheckBox chkSelect = (CheckBox)gvRows.FindControl("chkSelect");
               if (chkSelect.Checked)
                {

                    valStr = valStr + gvConAd.DataKeys[gvRows.RowIndex].Values["contid"].ToString();
                  

                    

                }
            }
        }

 

[taree]

thank you all. I found the problem. Here is the problem ...GridView gvRows

should be GridViewRow gvRows.....