C# and Access 2016 Database Perform SMART CRUD Operations with SEARCH (Windows Forms Source Code)

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👨‍🏫 How to Perform SMART CRUD (Create Read Update & Delete) Operations with Search functionality.

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In computer programming, create, read, update, and delete (CRUD) are the four basic functions of persistent storage. Alternate words are sometimes used when defining the four basic functions of CRUD, such as retrieve instead of read, modify instead of update, or destroy instead of delete.
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[FREE SOURCE CODE by iBASSKUNG]

#BEGIN

Class: CRUD.cs

using System.Data;
using System.Windows.Forms;
using System.Data.OleDb;

namespace CSAccess_SMART_CRUD_V1
{
    class CRUD
    {

        private static string getConnectionString()
        {
            string conString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Application.StartupPath;
                   conString += "\\cs_smart_crud.accdb;Persist Security Info=False;";
            return conString;
        }

        public static OleDbConnection con = new OleDbConnection(getConnectionString());
        public static OleDbCommand cmd = default(OleDbCommand);
        public static string sql = string.Empty;

        public static DataTable PerformCRUD(OleDbCommand com)
        {
            OleDbDataAdapter da = default(OleDbDataAdapter);
            DataTable dt = new DataTable();
            try
            {
                da = new OleDbDataAdapter();
                da.SelectCommand = com;
                da.Fill(dt);
                return dt;
            }
            catch (System.Exception ex)
            {
                MessageBox.Show("An error occurred: " + ex.Message,
                    "Perform CRUD Operations Failed : iBasskung Tutorial",
                    MessageBoxButtons.OK,MessageBoxIcon.Error);
                dt = null;
            }
            return dt;
        }
    }
}

Form: Form1.cs

using System;
using System.Data;
using System.Data.OleDb;
using System.Windows.Forms;

namespace CSAccess_SMART_CRUD_V1
{
    public partial class Form1 : Form
    {

        private string id = "";
        private int row = 0;

        public Form1()
        {
            InitializeComponent();
            resetMe();
        }

        private void resetMe()
        {

            this.id = "";

            firstNameTextBox.Text = "";
            lastNameTextBox.Text = "";

            if (genderComboBox.Items.Count > 0)
            {
                genderComboBox.SelectedIndex = 0;
            }

            updateButton.Text = "UPDATE ()";
            deleteButton.Text = "DELETE ()";

            keywordTextBox.Clear();
            keywordTextBox.Select();

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            loadData("");
        }

        private void execute(string mySQL, string param)
        {
            CRUD.cmd = new OleDbCommand(mySQL, CRUD.con);
            AddParameters(param);
            CRUD.PerformCRUD(CRUD.cmd);
        }

        private void AddParameters(string str)
        {

            CRUD.cmd.Parameters.Clear();

            if (str == "Delete" && !string.IsNullOrEmpty(this.id))
            {
                CRUD.cmd.Parameters.AddWithValue("id", this.id);
            }

            CRUD.cmd.Parameters.AddWithValue("firstName", firstNameTextBox.Text.Trim());
            CRUD.cmd.Parameters.AddWithValue("lastName", lastNameTextBox.Text.Trim());
            CRUD.cmd.Parameters.AddWithValue("gender", genderComboBox.SelectedItem.ToString().Trim());

            if (str == "Update" && !string.IsNullOrEmpty(this.id))
            {
                CRUD.cmd.Parameters.AddWithValue("id", this.id);
            }

        }

        private void insertButton_Click(object sender, EventArgs e)
        {

            if (string.IsNullOrEmpty(firstNameTextBox.Text.Trim()) || 
                string.IsNullOrEmpty(lastNameTextBox.Text.Trim()))
            {
                MessageBox.Show("Please input first name and last name.", 
                    "Insert Data : iBasskung Tutorial",
                    MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                return;
            }

            CRUD.sql = "INSERT INTO tb_smart_crud(first_name, last_name, gender) VALUES(@firstName, @lastName, @gender)";
            execute(CRUD.sql, "Insert");

            MessageBox.Show("The record has been saved.","Insert Data : iBasskung Tutorial",
                MessageBoxButtons.OK, MessageBoxIcon.Information);

            loadData("");

            resetMe();

        }

        private void loadData(string keyword)
        {

            CRUD.sql = "SELECT auto_id, first_name, last_name, first_name + ' ' + last_name AS full_name, gender FROM tb_smart_crud " +
                "WHERE first_name + ' ' + last_name LIKE @keyword1 OR gender = @keyword2 ORDER BY auto_id ASC";

            string strKeyword = string.Format("%{0}%", keyword);

            CRUD.cmd = new OleDbCommand(CRUD.sql, CRUD.con);

            CRUD.cmd.Parameters.Clear();
            CRUD.cmd.Parameters.AddWithValue("keyword1", strKeyword);
            CRUD.cmd.Parameters.AddWithValue("keyword2", keyword);

            DataTable dt = CRUD.PerformCRUD(CRUD.cmd);

            if(dt.Rows.Count > 0)
            {
                row = Convert.ToInt32(dt.Rows.Count.ToString());
            }
            else
            {
                row = 0;
            }

            toolStripStatusLabel1.Text = "Number of row(s): " + row.ToString();

            DataGridView dgv = dataGridView1;

            dgv.MultiSelect = false;
            dgv.AutoGenerateColumns = true;
            dgv.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

            dgv.DataSource = dt;

            dgv.Columns[0].HeaderText = "ID";
            dgv.Columns[1].HeaderText = "First Name";
            dgv.Columns[2].HeaderText = "Last Name";
            dgv.Columns[3].HeaderText = "Full Name";
            dgv.Columns[4].HeaderText = "Gender";

            dgv.Columns[0].Width = 80;
            dgv.Columns[1].Width = 170;
            dgv.Columns[2].Width = 170;
            dgv.Columns[3].Width = 210;
            dgv.Columns[4].Width = 100;

        }

        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if(e.RowIndex != -1)
            {

                DataGridView dgv = dataGridView1;

                this.id = Convert.ToString(dgv.CurrentRow.Cells[0].Value);
                updateButton.Text = "UPDATE (" + this.id + ")";
                deleteButton.Text = "DELETE (" + this.id + ")";

                firstNameTextBox.Text = Convert.ToString(dgv.CurrentRow.Cells[1].Value).Trim();
                lastNameTextBox.Text = Convert.ToString(dgv.CurrentRow.Cells[2].Value).Trim();
                // index 3 = Full Name
                genderComboBox.SelectedItem = Convert.ToString(dgv.CurrentRow.Cells[4].Value).Trim();

            }
        }

        private void updateButton_Click(object sender, EventArgs e)
        {

            if (dataGridView1.Rows.Count == 0)
            {
                return;
            }

            if (string.IsNullOrEmpty(this.id))
            {
                MessageBox.Show("Please select an item from the list.", "Update Data : iBasskung Tutorial",
                    MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                return;
            }

            if (string.IsNullOrEmpty(firstNameTextBox.Text.Trim()) ||
                string.IsNullOrEmpty(lastNameTextBox.Text.Trim()))
            {
                MessageBox.Show("Please input first name and last name.", "Update Data : iBasskung Tutorial",
                    MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                return;
            }

            CRUD.sql = "UPDATE tb_smart_crud SET first_name = @firstName, last_name = @lastName, gender = @gender WHERE auto_id = @id";
            execute(CRUD.sql, "Update");

            MessageBox.Show("The record has been updated.", "Update Data : iBasskung Tutorial",
                MessageBoxButtons.OK, MessageBoxIcon.Information);

            loadData("");

            resetMe();

        }

        private void deleteButton_Click(object sender, EventArgs e)
        {

            if (dataGridView1.Rows.Count == 0)
            {
                return;
            }

            if (string.IsNullOrEmpty(this.id))
            {
                MessageBox.Show("Please select an item from the list.", "Delete Data : iBasskung Tutorial",
                    MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                return;
            }

            if (MessageBox.Show("Do you want to delete the selected record?", "Delete Data : iBasskung Tutorial",
                MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {

                CRUD.sql = "DELETE FROM tb_smart_crud WHERE auto_id = @id";
                execute(CRUD.sql, "Delete");

                MessageBox.Show("The record has been deleted.", "Delete Data : iBasskung Tutorial",
                    MessageBoxButtons.OK, MessageBoxIcon.Information);

                loadData("");

                resetMe();

            }

        }

        private void searchButton_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(keywordTextBox.Text.Trim()))
            {
                loadData(this.keywordTextBox.Text.Trim());
            }
            else
            {
                loadData("");
            }

            resetMe();

        }
    }
}

#END

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#CSharp #VisualCSharp #AccessDatabase #CRUDOperation

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