getting an error, please help

protected void UpdateData(object sender, EventArgs e)
{
try
{
DataTable dt = new DataTable("VotersStat");

dt.Columns.Add("acid", typeof(int));
dt.Columns.Add("psid", typeof(int));
dt.Columns.Add("male", typeof(string));
dt.Columns.Add("female", typeof(string));
dt.Columns.Add("other", typeof(string));
dt.Columns.Add("epic", typeof(string));

foreach (GridViewRow grd in this.grdVotersTurnout.Rows)
{
int ACID = int.Parse((grd.FindControl("LitACID") as Literal).Text);
int PSID = AuxiliaryFunctions.GetPSIDByAuxiliaryValue((grd.FindControl("LitPSID") as Literal).Text);

int male, female, other, epic;

bool status = int.TryParse((grd.FindControl("TxtVMALE") as TextBox).Text, out male);

if (!status)
{
grd.Focus();
(grd.FindControl("TxtVMALE") as TextBox).Focus();
throw new Exception("Please check the value in male column for AC " + ACID + " and PS " + AuxiliaryFunctions.PSIDWithAuxiliaryValue(PSID));
}

status = int.TryParse((grd.FindControl("TxtVFEMALE") as TextBox).Text, out female);

if (!status)
{
grd.Focus();
(grd.FindControl("TxtVFEMALE") as TextBox).Focus();
throw new Exception("Please check the value in female column for AC - " + ACID + " and PS " + AuxiliaryFunctions.PSIDWithAuxiliaryValue(PSID));
}

status = int.TryParse((grd.FindControl("TxtVOTHER") as TextBox).Text, out other);

if (!status)
{
grd.Focus();
(grd.FindControl("TxtVOTHER") as TextBox).Focus();
throw new Exception("Please check the value in other column for AC - " + ACID + " and PS " + AuxiliaryFunctions.PSIDWithAuxiliaryValue(PSID));
}

status = int.TryParse((grd.FindControl("TxtEpic") as TextBox).Text, out epic);

if (!status)
{
grd.Focus();
(grd.FindControl("TxtEpic") as TextBox).Focus();
throw new Exception("Please check the value in epic column for AC - " + ACID + " and PS " + AuxiliaryFunctions.PSIDWithAuxiliaryValue(PSID));
}

string smale = string.Empty, sfemale = string.Empty, sother = string.Empty;

if (male > 0 || female > 0 || other > 0)
{
smale = male.ToString();
sfemale = female.ToString();
sother = other.ToString();
}

DataRow dr = dt.NewRow();

dr["acid"] = ACID;
dr["psid"] = PSID;
dr["male"] = smale;
dr["female"] = sfemale;
dr["other"] = sother;
dr["epic"] = epic.ToString();

dt.Rows.Add(dr);
}

dt.AcceptChanges();

foreach (DataRow dr in dt.Rows)
dr.SetModified();

try
{
FinalVotersTurnout fvt = new FinalVotersTurnout();
int flag = fvt.UpdateFinalVotersTurnout(dt);

if (flag == 1)
{
this.lblMsg.Visible = true;
this.lblMsg.Text = "Voters Turnout has been updated successfully.";

this.isEditMode = false;

this.ViewState["EditMode"] = fals