C# and SQL Server (V2) Perform SMART CRUD Operations with SEARCH (Windows Forms Source Code)

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Microsoft Visual Studio 2019 : C# and Microsoft SQL Server Database Tutorial (Version 2).
ðŸ‘Ļ‍ðŸŦ 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.
Read more: Wikipedia

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[FREE SOURCE CODE by iBASSKUNG]

ðŸŽŊ Souce Code: http://bit.ly/35R1sLM

#BEGIN

Form: CRUD_Form.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace CS_SMART_CRUD_V2
{
    public partial class CRUD_Form : Form
    {

        private string strConString = "Data Source=TANIN-SANGNGAM\\SQLEXPRESS;Initial Catalog=CS_SMART_CRUD;Integrated Security=True";
        private string sql = string.Empty;
        private string id = string.Empty;
        private int intRow = 0;

        MessageBoxButtons okBtn = MessageBoxButtons.OK;
        MessageBoxIcon infoIco = MessageBoxIcon.Information;

        public CRUD_Form()
        {
            InitializeComponent();
            loadData("");
            resetMe();
           
        }

        private void loadData(string keyword)
        {
            sql = "SELECT AUTO_ID AS ID, FIRST_NAME AS [First Name], LAST_NAME AS [Last Name], [FIRST_NAME] + ' ' + [LAST_NAME] AS [Full Name], " +
                "GENDER AS [Gender] FROM TBL_SMART_CRUD WHERE ([FIRST_NAME] + ' ' + [LAST_NAME]) LIKE '%' + @keyword + '%' OR [GENDER] = @keyword";

            DataTable dt = PerformCRUD(sql, "select");

            if(dt.Rows.Count > 0)
            {
                intRow = Convert.ToInt32(dt.Rows.Count.ToString());
            }
            else
            {
                intRow = 0;
            }
            
            toolStripStatusLabel1.Text = "Number of row(s): " + intRow.ToString();

            dataGridView1.MultiSelect = false;
            dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

            dataGridView1.DataSource = dt;

            dataGridView1.Columns[0].Width = 70;
            dataGridView1.Columns[1].Width = 150;
            dataGridView1.Columns[2].Width = 150;
            dataGridView1.Columns[3].Width = 200;
            dataGridView1.Columns[4].Width = 90;

            if (dataGridView1.Rows.Count > 0)
            {
                dataGridView1.CurrentCell = dataGridView1.Rows[0].Cells[0];
            }

        }

        private void resetMe()
        {
            this.id = string.Empty;

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

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

            updateButton.Text = "Update ()";
            deleteButton.Text = "Delete ()";

            keywordTextBox.Text = "";

            if (keywordTextBox.CanSelect)
            {
                keywordTextBox.Select();
            }

        }

        private void CRUD_Form_Load(object sender, EventArgs e)
        {
           dataGridView1.CellClick += dataGridView1_SelectionChanged;
        }

        private void dataGridView1_SelectionChanged(object sender, EventArgs e)
        {
            try
            {
                if (dataGridView1.SelectedRows.Count > 0)
                {
                    this.id = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
                    updateButton.Text = "Update (" + this.id + ")";
                    deleteButton.Text = "Delete (" + this.id + ")";

                    DataGridViewRow row = dataGridView1.SelectedRows[0];

                    firstNameTextBox.Text = row.Cells[1].Value.ToString();
                    lastNameTextBox.Text = row.Cells[2].Value.ToString();

                    // Cells[3] = Full Name
                    
                    genderComboBox.SelectedItem = row.Cells[4].Value.ToString();


                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("An error occurred: " + ex.Message, "C# Programming : iBasskung Tutorial", okBtn, MessageBoxIcon.Error);
            }
        }

        private DataTable PerformCRUD(string mySQL, string str)
        {

            using (SqlConnection con = new SqlConnection(strConString))
            {
                using (SqlCommand cmd = new SqlCommand(mySQL, con))
                {
                    cmd.Parameters.Clear();

                    if (str.Equals("select"))
                    {
                        cmd.Parameters.AddWithValue("keyword", keywordTextBox.Text.Trim().ToString());
                    }

                    if (str.Equals("insert") || str.Equals("update"))
                    {
                        cmd.Parameters.AddWithValue("firstName", firstNameTextBox.Text.Trim().ToString());
                        cmd.Parameters.AddWithValue("lastName", lastNameTextBox.Text.Trim().ToString());
                        cmd.Parameters.AddWithValue("gender", genderComboBox.SelectedItem.ToString());
                    }

                    if (str.Equals("update") || str.Equals("delete") && !string.IsNullOrEmpty(this.id))
                    {
                        cmd.Parameters.AddWithValue("id", this.id);
                    }

                    SqlDataAdapter da = default(SqlDataAdapter);
                    DataTable dt = new DataTable();

                    da = new SqlDataAdapter();
                    da.SelectCommand = cmd;
                    da.Fill(dt);

                    return dt;

                }
            }
        }

        private void insertButton_Click(object sender, EventArgs e)
        {
            string caption = "Insert Data : iBasskung Tutorial";

            if (string.IsNullOrEmpty(firstNameTextBox.Text.Trim()) || string.IsNullOrEmpty(lastNameTextBox.Text.Trim()))
            {
                MessageBox.Show("Please input first name and last name.", caption, okBtn, infoIco);
                firstNameTextBox.Select();
                return;
            }

            sql = "INSERT INTO TBL_SMART_CRUD(FIRST_NAME, LAST_NAME, GENDER) VALUES(@firstName, @lastName, @gender)";

            PerformCRUD(sql, "insert");

            MessageBox.Show("The record has been saved!", caption, okBtn, infoIco);

            resetMe();

            loadData("");

        }

        private void updateButton_Click(object sender, EventArgs e)
        {
            string caption = "Update Data : iBasskung Tutorial";

            if (dataGridView1.Rows.Count == 0)
            {
                MessageBox.Show(dataGridView1.Rows.Count.ToString() + " No rows found.", caption, okBtn, infoIco);
                return;
            }

            if (updateButton.Text.Equals("Update ()") || string.IsNullOrEmpty(this.id))
            {
                MessageBox.Show("Please select an item from the list.", caption, okBtn, infoIco);
                return;
            }

            if (string.IsNullOrEmpty(firstNameTextBox.Text.Trim()) || string.IsNullOrEmpty(lastNameTextBox.Text.Trim()))
            {
                MessageBox.Show("Please input first name and last name.", caption, okBtn, infoIco);
                firstNameTextBox.Select();
                return;
            }
            
            sql = "UPDATE TBL_SMART_CRUD SET FIRST_NAME = @firstName, LAST_NAME = @lastName, GENDER = @gender WHERE AUTO_ID = @id";

            PerformCRUD(sql, "update");

            MessageBox.Show("The record has been updated!", caption, okBtn, infoIco);

            resetMe();

            loadData("");

        }

        private void deleteButton_Click(object sender, EventArgs e)
        {

            string caption = "Delete Data : iBasskung Tutorial";

            if (dataGridView1.Rows.Count == 0)
            {
                MessageBox.Show(dataGridView1.Rows.Count.ToString() + " No rows found.", caption, okBtn, infoIco);
                return;
            }

            if (deleteButton.Text.Equals("Delete ()") || string.IsNullOrEmpty(this.id))
            {
                MessageBox.Show("Please select an item from the list.", caption, okBtn, infoIco);
                return;
            }

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

            if (result == DialogResult.Yes)
            {
                sql = "DELETE FROM TBL_SMART_CRUD WHERE AUTO_ID = @id";

                PerformCRUD(sql, "delete");

                MessageBox.Show("The record has been deleted.", caption, okBtn, infoIco);

                resetMe();
                loadData("");

            }

        }

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

    }
}

#END

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