there is no error but edit and delete is not working

private void BindData()

{

string strQuery = "select Name, BillNo,BillDate, Address,Phone,EmailId,Supplierfor,Brand,Billingrate,vat,discount,total,percentage,amount" + " from suplerrate";

SqlCommand cmd = new SqlCommand(strQuery);

GridView1.DataSource = GetData(cmd);

GridView1.DataBind();

}

private DataTable GetData(SqlCommand cmd)

{

DataTable dt = new DataTable();

SqlConnection con = new SqlConnection(strConnString);

SqlDataAdapter sda = new SqlDataAdapter();

cmd.CommandType = CommandType.Text;

cmd.Connection = con;

con.Open();

sda.SelectCommand = cmd;

sda.Fill(dt);

return dt;

}

protected void EditCustomer(object sender, GridViewEditEventArgs e)

{

GridView1.EditIndex = e.NewEditIndex;

BindData();

}

protected void AddNewCustomer(object sender, EventArgs e)

{

string nm = ((TextBox)GridView1.FooterRow.FindControl("txbna")).Text;

string BNo = ((TextBox)GridView1.FooterRow.FindControl("txnbno")).Text;

string bdate = ((TextBox)GridView1.FooterRow.FindControl("txtbildate")).Text;

string adre = ((TextBox)GridView1.FooterRow.FindControl("txtadrsse")).Text;

string phn = ((TextBox)GridView1.FooterRow.FindControl("txtphnebin")).Text;

string emil = ((TextBox)GridView1.FooterRow.FindControl("txtemidl")).Text;

string supfr = ((TextBox)GridView1.FooterRow.FindControl("txtsupfor")).Text;

string bbd = ((TextBox)GridView1.FooterRow.FindControl("txtbnd")).Text;

string bigt = ((TextBox)GridView1.FooterRow.FindControl("txtbingnnt")).Text;

string vatt = ((TextBox)GridView1.FooterRow.FindControl("txvaatb")).Text;

string bdiste = ((TextBox)GridView1.FooterRow.FindControl("txtdiscnt")).Text;

string tool = ((TextBox)GridView1.FooterRow.FindControl("txttoool")).Text;

string pentg = ((TextBox)GridView1.FooterRow.FindControl("txtpecntge")).Text;

string txtamt = ((TextBox)GridView1.FooterRow.FindControl("txtamnut")).Text;

SqlConnection con = new SqlConnection(strConnString);

SqlCommand cmd = new SqlCommand();

cmd.CommandType = CommandType.Text;

cmd.CommandText = "insert into suplerrate(Name, BillNo,BillDate, Address,Phone,EmailId,Supplierfor,Brand,Billingrate,vat,discount,total,percentage,amount) " +

"values(@Name, @BillNo, @BillDate,@Address,@Phone,@EmailId,@Supplierfor,@Brand,@Billingrate,@vat,@discount,@total,@percentage,@amount);" +

"select Name, BillNo,BillDate, Address,Phone,EmailId,Supplierfor,Brand,Billingrate,vat,discount,total,percentage,amount from suplerrate";

cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = nm;

cmd.Parameters.Add("@BillNo", SqlDbType.VarChar).Value = BNo;

cmd.Parameters.Add("@BillDate", SqlDbType.VarChar).Value = bdate;

cmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = adre;

cmd.Parameters.Add("@Phone", SqlDbType.BigInt).Value = phn;

cmd.Parameters.Add("@EmailId", SqlDbType.VarChar).Value = emil;

cmd.Parameters.Add("@Supplierfor", SqlDbType.VarChar).Value = supfr;

cmd.Parameters.Add("@Brand", SqlDbType.VarChar).Value = bbd;

cmd.Parameters.Add("@Billingrate", SqlDbType.Float).Value = bigt;

cmd.Parameters.Add("@vat", SqlDbType.Float).Value = vatt;

cmd.Parameters.Add("@discount", SqlDbType.Float).Value = bdiste;

cmd.Parameters.Add("@total", SqlDbType.Float).Value = tool;

cmd.Parameters.Add("@percentage", SqlDbType.Float).Value = pentg;

cmd.Parameters.Add("@amount", SqlDbType.Float).Value = txtamt;

GridView1.DataSource = GetData(cmd);

GridView1.DataBind();

}

protected void CancelEdit(object sender, GridViewCancelEditEventArgs e)

{

GridView1.EditIndex = -1;

BindData();

}

protected void UpdateCustomer(object sender, GridViewUpdateEventArgs e)

{

string nm = ((Label)GridView1.Rows[e.RowIndex].FindControl("lblname")).Text;

string BNo = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txnbno")).Text;

string bdate = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtbildate")).Text;

string adre = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtadrsse")).Text;

string phn = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtphnebin")).Text;

string emil = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtemidl")).Text;

string supfr = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtsupfor")).Text;

string bbd = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtbnd")).Text;

string bigt = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtbingnnt")).Text;

string vatt = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txvaatb")).Text;

string bdiste = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtdiscnt")).Text;

string tool = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txttoool")).Text;

string pentg = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtpecntge")).Text;

string txtamt = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtamnut")).Text;

SqlConnection con = new SqlConnection(strConnString);

SqlCommand cmd = new SqlCommand();

cmd.CommandType = CommandType.Text;

cmd.CommandText = "update suplerrate set BillNo=@BillNo," + "BillDate=@BillDate," + "Address=@Address, " + " Phone=@Phone ," + " EmailId=@EmailId," + "Supplierfor=@Supplierfor," + "Brand=@Brand," + "Billingrate=@Billingrate," + "vat=@vat," + "discount=@discount," + "total=@total," + "percentage=@percentage," + "amount=@amount where Name=@Name;" +

"select Name, BillNo,BillDate, Address,Phone,EmailId,Supplierfor,Brand,Billingrate,vat,discount,total,percentage,amount from suplerrate";

cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = nm;

cmd.Parameters.Add("@BillNo", SqlDbType.VarChar).Value = BNo;

cmd.Parameters.Add("@BillDate", SqlDbType.VarChar).Value = bdate;

cmd.Parameters.Add("@Address", SqlDbType.VarChar).Value = adre;

cmd.Parameters.Add("@Phone", SqlDbType.BigInt).Value = phn;

cmd.Parameters.Add("@EmailId", SqlDbType.VarChar).Value = emil;

cmd.Parameters.Add("@Supplierfor", SqlDbType.VarChar).Value = supfr;

cmd.Parameters.Add("@Brand", SqlDbType.VarChar).Value = bbd;

cmd.Parameters.Add("@vat", SqlDbType.Float).Value = vatt;

cmd.Parameters.Add("@discount", SqlDbType.Float).Value = bdiste;

cmd.Parameters.Add("@total", SqlDbType.Float).Value = tool;

cmd.Parameters.Add("@percentage", SqlDbType.Float).Value = pentg;

cmd.Parameters.Add("@amount", SqlDbType.Float).Value = txtamt;

GridView1.EditIndex = -1;

GridView1.DataSource = GetData(cmd);

GridView1.DataBind();

}

protected void DeleteCustomer(object sender, EventArgs e)

{

LinkButton lnkRemove = (LinkButton)sender;

SqlConnection con = new SqlConnection(strConnString);

SqlCommand cmd = new SqlCommand();

cmd.CommandType = CommandType.Text;

cmd.CommandText = "delete from suplerrate where " +

"Name=@Name;" +

"select Name, BillNo,BillDate, Address,Phone,EmailId,Supplierfor,Brand,Billingrate,vat,discount,total,percentage,amount from suplerrate";

cmd.Parameters.Add("@Name", SqlDbType.VarChar).Value = lnkRemove.CommandArgument;

GridView1.DataSource = GetData(cmd);

GridView1.DataBind();

}