How to import Excel file data into database? - database

Question

I've created a form where the manager can import an Excel file to DataGridView but I'm having trouble saving it to the database.
Reason: So when the manager imports the rota Excel file to DataGridView I want the other users to see it in a different form.
My form code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Data.OleDb;
using System.Data.SqlClient;
namespace Login
{
public partial class EmployeeRota : Form
{
string con = "Data Source=dqq5ndqef2.database.windows.net;Initial Catalog=Login;Integrated Security=False;User ID=richardjacobs97;Password=;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";
SqlDataAdapter sda;
SqlCommandBuilder scb;
DataTable dt;
public EmployeeRota()
{
InitializeComponent();
}
private void btnSelect_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
this.textBox1.Text = openFileDialog1.FileName;
}
}
private void button1_Click(object sender, EventArgs e)
{
string PathCpnn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source= " + textBox1.Text + ";Extended Properties=\"Excel 8.0;HDR=Yes;\";";
OleDbConnection conn = new OleDbConnection(PathCpnn);
OleDbDataAdapter myDataAdapter = new OleDbDataAdapter("Select * from [" + textBox2.Text + "$]", conn);
DataTable dt = new DataTable();
myDataAdapter.Fill(dt);
dataGridView1.DataSource = dt;
myDataAdapter.Update(dt);
}
private void EmployeeRota_Load(object sender, EventArgs e)
{
string connectionString = con;
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand("INSERT INTO Rota (Id, Name, Date) Values (#Id, #Name, #Date)");
cmd.CommandType = CommandType.Text;
cmd.Connection = connection;
int i = 0;
i = dataGridView1.RowCount - 1;
cmd.Parameters.AddWithValue("#Id", dataGridView1.Rows[i].Cells[0].Value);
cmd.Parameters.AddWithValue("#Name", dataGridView1.Rows[i].Cells[1].Value);
cmd.Parameters.AddWithValue("#Date", dataGridView1.Rows[i].Cells[0].Value);
dt = new DataTable();
sda.Fill(dt);
dataGridView1.DataSource = dt;
scb = new SqlCommandBuilder(sda);
sda.Update(dt);
}
}
}
}
Database: Database pic
Form: Form pic
Any suggestions why I get this error?
An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll
Additional information: Index was out of range. Must be non-negative and less than the size of the collection.

Answer 1

You are receiving that error because the Load function runs when the page is first opened. You should move this into a separate functions so that it can be called at select times, maybe from a button click. This is prior to any data source being applied to the
DataGridView. You need to add the following to make sure there are rows in the table.
i = dataGridView1.RowCount - 1;
if(i<0) // Meaning that the row count was 0
{
return;
}
cmd.Parameters.AddWithValue("#Id", dataGridView1.Rows[i].Cells[0].Value);
cmd.Parameters.AddWithValue("#Name", dataGridView1.Rows[i].Cells[1].Value);
cmd.Parameters.AddWithValue("#Date", dataGridView1.Rows[i].Cells[0].Value);