Question

Am new to programming, so please assist as much as possible!
Recently, im tasked to do a CRUD windows form application using C# & MS access.

In my update function, i face one of the following errors which im not sure why..
My data are not able to be updated either.

Error: ArgumentException was unhandled

Input string was not in a correct format.Couldn’t store
in staff_id Column. Expected type is
Int32.

Here is my code:

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 AcuzioSapp.AcuzioSecureStore_DatabaseDataSetTableAdapters;

namespace AcuzioSapp
{
    public partial class Update_Client : Form
    {
        private DataRow row;
        private ClientTableAdapter adapter;
        public Update_Client(DataRow row, ClientTableAdapter adapter)
        {
            InitializeComponent();
            this.row = row;
            this.adapter = adapter;
            textBox_id1.Text = Convert.ToString(row["c_id"]);
            textBox_name1.Text = Convert.ToString(row["c_name"]);
            textBox_address1.Text = Convert.ToString(row["c_address"]);
            textBox_cinfo1.Text = Convert.ToString(row["c_contactinfo"]);
            textBox_pinfo1.Text = Convert.ToString(row["profile_info"]);
            textBox_refno1.Text = Convert.ToString(row["c_8digitrefno"]);
            textBox_staffid1.Text = Convert.ToString(row["staff_id"]);
        }

        private void button_close_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void button_update_Click(object sender, EventArgs e)
        {
            row["c_name"] = "textBox_name1";
            row["c_address"] = "textBox_address1";
            row["c_contactinfo"] = "int.Parse(textBox_cinfo1)";
            row["c_8digitrefno"] = "(textBox_pinfo1)";
            row["profile_info"] = "textBox_refno1";
            row["staff_id"] = "int.Parse(textBox_staffid1)";

            adapter.Update(row);
        }
    }
}

Appreciated for help and explanation thankyou.

Answer 1

Thats because of your column is declared integer in your Access database and you try to insert a String value in it. And I also think you will not get proper value in your specified table because you update your columns by constant string (row["profile_info"] = "textBox_refno1";), this will insert textBox_refno1 into profile_info column not TextBox value.
Try this :

row["staff_id"] = Convert.ToInt32(textBox_staffid1.Text);

Update:
Copy and paste following code, and you will never have any issue:

    private void button_update_Click(object sender, EventArgs e)
    {
        row["c_name"] = textBox_name1.Text;
        row["c_address"] = textBox_address1.Text;
        row["c_contactinfo"] = int.Parse(textBox_cinfo1.Text);
        row["c_8digitrefno"] = textBox_pinfo1.Text;
        row["profile_info"] = textBox_refno1.Text;
        row["staff_id"] = int.Parse(textBox_staffid1.Text);

        adapter.Update(row);

        MessageBox.Show("Data has been updated");
    }

Hope this help.