CNSA-212-Personal/Database3/frmSearch.cs

using System;
using System.Data;
using System.Drawing;
using System.Windows.Forms;



namespace Database3
{
    public partial class frmSearch : Form
    {
        
        public static string myID = "";
        
        public frmSearch()
        {
            InitializeComponent();

            dgvStudents.DoubleClick += new EventHandler(dgvStudents_DoubleClick);

        }

        private void dgvStudents_DoubleClick(object sender, EventArgs e)
        {

            string studentid = "";

            if (dgvStudents.Rows.Count > 0)
            {
                DataGridViewRow row = dgvStudents.SelectedRows[0];
                frmEdit aform = new frmEdit(this);

                studentid = row.Cells[0].Value.ToString().Trim();
                myID = studentid;
                aform.ShowDialog();
                
            }

        }

        
        
        public  void btnSearch_Click(object sender, EventArgs e)
        {
            string studentid = "9999999999";
            string lname = "9999999999";
            DateTime dob = new DateTime();

            ErrorProvider ep1 = new ErrorProvider();
            
            try
            {
                DataSet ds = new DataSet();
                StudentDataTier stuDT = new StudentDataTier();


                    studentid = txtStuID.Text;
                    lname = txtlname.Text;
                try
                {
                    dob = DateTime.Parse(txtDOB.Text);

                }
                catch (Exception exception)
                {
                    ep1.SetError(txtDOB, "Non valid value, but that's ok");
                }

                if (string.IsNullOrWhiteSpace(txtStuID.Text) &&
                    string.IsNullOrWhiteSpace(txtlname.Text) &&
                    string.IsNullOrWhiteSpace(txtDOB.Text))
                {
                    throw new Exception("Must Enter at least one value");
                }
                
                // Get the dataset using all three search parameters.
                ds = stuDT.GetStudents(studentid, lname, dob);

                // Check to see if any record is returned.
                if (ds.Tables[0].Rows.Count > 0) // There is a record.
                {
                    dgvStudents.Visible = true;
                    // Get data source.
                    dgvStudents.DataSource = ds.Tables[0];
                    dgvStudents.AlternatingRowsDefaultCellStyle.BackColor = Color.LightGreen;

                    // Set the row and column header styles.
                    dgvStudents.ColumnHeadersDefaultCellStyle.ForeColor = Color.White;
                    dgvStudents.ColumnHeadersDefaultCellStyle.BackColor = Color.Green;
                }
                else
                {
                    dgvStudents.Visible = false; // Hide the DataGridView if no results are found.
                    MessageBox.Show("No records found.");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"An error occurred: {ex.Message}");
            }
        }

        private void frmSearch_Load(object sender, EventArgs e)
        {
            dgvStudents.Visible = false;
            contextMenuStrip1.Items[1].Enabled = false;
        }

        private void cmuSearch_Click(object sender, EventArgs e)
        {
            btnSearch_Click(sender,e);
        }

        private void txtStuID_TextChanged(object sender, EventArgs e)
        {
            cmuSearch.Enabled = txtStuID.Text.Length>0;
        }

        private void cmuEdit_Click(object sender, EventArgs e)
        {
         dgvStudents_DoubleClick(sender, e);   
        }

        private void cmuDelete_Click(object sender, EventArgs e)
        {
            string studentid = "";
            
                DataSet ds = new DataSet();
                StudentDataTier stuDT = new StudentDataTier();

                DataGridViewRow row = dgvStudents.SelectedRows[0];

                studentid = row.Cells[0].Value.ToString().Trim();

                stuDT.DeleteStudents(studentid);

                btnSearch_Click(sender, e);
          
        }
    }

    }