find the single row in gridview

da = new SqlDataAdapter("select * from tblleavemaster", cn);
        ds.Reset();
        da.Fill(ds, "tblleavemaster");
        if (ds.Tables[0].Rows.Count > 0)
        {
            foreach (GridViewRow gr1 in gvclasslist.Rows)
            {
                foreach (DataTable myTable in ds.Tables)
                {
                    foreach (DataRow myRow in myTable.Rows)
                    {
                        leavesid = Convert.ToInt32(myRow["studentid"].ToString());
                        DateTime fromdate = Convert.ToDateTime(myRow["fromdate"].ToString());
                        DateTime Todate = Convert.ToDateTime(myRow["todate"].ToString());
                        DateTime todaydate = DateTime.Now;
                        System.Web.UI.WebControls.Label lbl = new System.Web.UI.WebControls.Label();
                        lbl = (System.Web.UI.WebControls.Label)gr1.FindControl("Label1");
                        attendancesid = Convert.ToInt32(lbl.Text);
                        if (leavesid == attendancesid)
                        {
                            if (Todate <= todaydate)
                            {
                                gr1.Enabled = true;
                            }
                            else
                            {
                                gr1.Enabled = false;
                            }


                        }
                    }
                }

upload image and save binary format show image in picture box

if (fileuploadlogo.PostedFile.ContentLength == 0)
        {
            lblerrordesc.Visible = true;
            lblerrordesc.Text = "Please Upload Photo !!!";
        }
        else
        {
            Stream imgStream = fileuploadlogo.PostedFile.InputStream;
            int imgLen = fileuploadlogo.PostedFile.ContentLength;
            string imgContentType = fileuploadlogo.PostedFile.ContentType;
            byte[] imgBinaryData = new byte[imgLen];
            int n = imgStream.Read(imgBinaryData, 0, imgLen);
            photodata = imgBinaryData;
            phototype = imgContentType;
            Session["photodata"] = imgBinaryData;
            Session["phototype"] = imgContentType;
            Image3.ImageUrl = "studentphoto.aspx?type=" + imgContentType + "";
        }