"Input String was not in a correct Format"

[SkyCross]

Pls do help me, I got an error Input String was not in a correct format.

Here is the code where error appears,

This is in my Record form.
After I click edit, it will be redirected to my Update2 form

Update2 f2 = new Update2();
                f2.BlockNo1 = Convert.ToInt32(BlockNo1);//error here
                f2.Firstname = Firstname;
                f2.Familyname = Familyname;
                f2.Dateofbirth = Dateofbirth;
                f2.Age = Age;
                f2.Bloodtype = Bloodtype;
                f2.Placeofbirth = Placeofbirth;
                f2.Religion = Religion;
                f2.Startofoccupancy = Startofoccupancy;
                f2.Contactnumber = Contactnumber;
                f2.NumberofChildren = NumberofChildren;
                f2.Numberofdogs = Numberofdogs;
                f2.Vaccinatedwithantirabies = Vaccinatedwithantirabies;
                f2.id1 = BlocNum2;
                f2.Show();
                dataGridView2.Update();
            }

Pls help me, Thank you

BlockNo1 in my table Spouse is a Number.

Here are the code for my Update2 form.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;

namespace sad
{
    public partial class Update2 : Form
    {
        public string Firstname, Familyname, Dateofbirth, Age, Bloodtype, Placeofbirth, Religion, Startofoccupancy, Contactnumber, NumberofChildren, Numberofdogs, Vaccinatedwithantirabies;
        public int id1, BlockNo1;
        public Update2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OleDbCommand SQLCommand = new OleDbCommand();

           try
            {
                Records f1 = new Records();
                BlockNo1 = Convert.ToInt32(textBox11.Text);
                Firstname=textBox12.Text;
                Familyname = textBox13.Text;
                Dateofbirth = textBox14.Text;
                Age = textBox15.Text;
                Bloodtype = textBox16.Text;
                Placeofbirth = textBox17.Text;
                Religion = textBox18.Text;
                Startofoccupancy = textBox19.Text;
                Contactnumber = textBox20.Text;
                NumberofChildren = textBox21.Text;
                Numberofdogs = textBox22.Text;
                Vaccinatedwithantirabies = textBox23.Text;
                string SQLUpdateString;



                if (BlockNo1 == 0)
                {
                    SQLUpdateString = "UPDATE Personaldata SET BlockNo =" + BlockNo1.ToString() + ", Firstname='" + Firstname + "', Familyname='" + Familyname + "', Dateofbirth='" + Dateofbirth + "', Familyname='" + Familyname + "', Dateofbirth='" + Dateofbirth + "', Age='" + Age + "', Blooodtype='" + Bloodtype + "', Placeofbirth='" + Placeofbirth + "', Religion='" + Religion + "', Startofoccupancy='" + Startofoccupancy + "', Contactnumber='" + Contactnumber + "', NumberofChildren='" + NumberofChildren + "', Numberofdogs='" + Numberofdogs + "', Vaccinatedwithantirabies='" + Vaccinatedwithantirabies + "' WHERE BlockNo=" + BlockNo1 + "";

                }

                else
                {
                    SQLUpdateString = "UPDATE Personaldata SET BlockNo =" + BlockNo1.ToString() + ", Firstname='" + Firstname + "', Familyname='" + Familyname + "', Dateofbirth='" + Dateofbirth + "', Familyname='" + Familyname + "', Dateofbirth='" + Dateofbirth + "', Age='" + Age + "', Blooodtype='" + Bloodtype + "', Placeofbirth='" + Placeofbirth + "', Religion='" + Religion + "', Startofoccupancy='" + Startofoccupancy + "', Contactnumber='" + Contactnumber + "', NumberofChildren='" + NumberofChildren + "', Numberofdogs='" + Numberofdogs + "', Vaccinatedwithantirabies='" + Vaccinatedwithantirabies + "' WHERE BlockNo=" + BlockNo1 + "";


                }


                SQLCommand.CommandText = SQLUpdateString;
                SQLCommand.Connection = f1.database;
                SQLCommand.ExecuteNonQuery();






                MessageBox.Show("Update successful!", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
                this.Hide();
                Records frm = new Records();
                frm.Show();
            }

           catch (Exception)
           {

           }
        }

        private void Update2_Load(object sender, EventArgs e)
        {
            textBox11.Text =""+BlockNo1;
            textBox12.Text = Firstname;
            textBox13.Text = Familyname;
            textBox14.Text =  Dateofbirth;
            textBox15.Text = Age;
            textBox16.Text =Bloodtype;
            textBox17.Text = Placeofbirth;
            textBox18.Text = Religion;
            textBox19.Text = Startofoccupancy;
            textBox20.Text = Contactnumber;
            textBox21.Text = NumberofChildren;
            textBox22.Text = Numberofdogs;
            textBox23.Text = Vaccinatedwithantirabies;
        }





    }
}

[cgeier]

That error occurs if you have non-numeric data in the variable that you are trying to convert. Check to see what "BlockNo1" contains.

[Momerath]

Which would have taken you 10 seconds to look up on MSDN instead of wasting everyones time posting here.

[ZER09]

try this

f2.BlockNo1 = Convert.ToInt32(BlockNo1.ToString());