I'm trying to use a combobox to set the ID of a company by using the name, which is like this
Caetano Coatings = 1
Dura = 2
And so on...
But atm i'm having issues with an error like this one on the title.
this is the code i have on my winform.
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 MySql.Data.MySqlClient;
namespace Portaria
{
public partial class DarEntrada : Form
{
public DarEntrada()
{
InitializeComponent();
}
private void label1_Click(object sender, EventArgs e)
{
}
private void DarEntrada_Load(object sender, EventArgs e)
{
dateTimePicker1.Enabled = false;
this.empresasTableAdapter.Fill(this.portariaDataSet.empresas);
txtmatpers.Visible = false;
txtsector.Enabled = false;
FillDropDownList();
SaveComboBoxContent();
}
public void FillDropDownList()
{
string SQL = "SELECT id_empresa, nome_empresa FROM empresas ORDER BY nome_empresa";
DataTable dt = new DataTable();
using (var cn = new MySqlConnection(@"server=localhost;user id=root;password=12345;persistsecurityinfo=True;database=portaria"))
{
using (var cmd = new MySqlCommand(SQL, cn))
{
cn.Open();
try
{
dt.Load(cmd.ExecuteReader());
}
catch (MySqlException e)
{
MessageBox.Show("Ocurreu um erro ao aceder á sua base de dados, contacte um administrador. Detalhe do erro: " + e.ToString());
}
}
}
comboBox1.DataSource = dt;
comboBox1.ValueMember = "id_empresa";
comboBox1.DisplayMember = "nome_empresa";
}
public void SaveComboBoxContent()
{
string SQL = "INSERT INTO entradas (nome_empresa_id_empresa) VALUES (@nome_empresa_id_empresa)";
using (var cn = new MySqlConnection("server = localhost; user id = root;password = 12345; persistsecurityinfo = True; database = portaria"))
{
using (var cmd = new MySqlCommand(SQL, cn))
{
cmd.Parameters.AddWithValue("@name_id", comboBox1.SelectedValue);
cn.Open();
try
{
cmd.ExecuteNonQuery();
}
catch (MySqlException e)
{
MessageBox.Show("There was an error accessing your data. DETAIL: " + e.ToString());
}
}
}
}
private void chkmatpers_CheckedChanged(object sender, EventArgs e)
{
try
{
if (chkmatpers.Checked == true)
{
msktxtmat.Mask = null;
}else
{
msktxtmat.Mask = "00-00-AA";
}
}catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void chkvariasemp_CheckedChanged(object sender, EventArgs e)
{
try
{
if (chkvariasemp.Checked == true)
{
}
else
{
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void chksector_CheckedChanged(object sender, EventArgs e)
{
txtsector.Enabled = false;
try
{
if(chksector.Checked == true)
{
txtsector.Enabled = true;
}
else
{
txtsector.Enabled = false;
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void chkhoraentrada_CheckedChanged(object sender, EventArgs e)
{
dateTimePicker1.Enabled = false;
try
{
if(chkhoraentrada.Checked == true)
{
dateTimePicker1.Enabled = true;
}
else
{
dateTimePicker1.Enabled = false;
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void button1_Click(object sender, EventArgs e)
{
if (chkmatpers.Checked)
{
DialogResult dr = MessageBox.Show("Deseja mesmo gravar estas alterações?", "Confirmação", MessageBoxButtons.YesNo,
MessageBoxIcon.Information);
if (dr == DialogResult.Yes)
{
string con = "server=localhost;userid=root;password=12345;persistsecurityinfo=True;database=portaria";
string query = "Insert into entradas(id_veiculo,empresa_visitante,empresa_visitar,nome_condutor,visitado,ncartao,data,hora,obs) values('"+ msktxtmat.Text +"','"+ txtempvis.Text +"','"+ comboBox1.SelectedValue +"', '"+ txtnomecondutor.Text +"','"+ txtpessoavisitar.Text +"', '"+ txtncartao.Text +"', '"+ DateTime.Now.ToString("yyyy-MM-dd") +"', '"+ DateTime.Now.ToShortTimeString() +"','"+ txtobs.Text +"');";
MySqlConnection Con = new MySqlConnection(con);
MySqlCommand Command = new MySqlCommand(query, Con);
MySqlDataAdapter sda = new MySqlDataAdapter();
DataTable dt = new DataTable();
sda.SelectCommand = Command;
sda.Fill(dt);
}
}else
{
DialogResult dr = MessageBox.Show("Deseja mesmo gravar estas alterações?", "Confirmação", MessageBoxButtons.YesNo,
MessageBoxIcon.Information);
if (dr == DialogResult.Yes)
{
string con = "server=localhost;userid=root;password=12345;persistsecurityinfo=True;database=portaria";
string query = "Insert into entradas(id_veiculo,empresa_visitante,empresa_visitar,nome_condutor,visitado,ncartao,data,hora,obs) values(@msktxtmat,@txtempvis,@comboBox1,@txtnomecondutor,@txtpessoavisitar,@txtncartao,@data,@horas,@txtobs);";
MySqlConnection Con = new MySqlConnection(con);
MySqlCommand Command = new MySqlCommand(query, Con);
Command.Parameters.AddWithValue("@msktxtmat", msktxtmat.Text);
Command.Parameters.AddWithValue("@txtempvis", txtempvis.Text);
Command.Parameters.AddWithValue("@comboBox1", comboBox1.SelectedValue);
Command.Parameters.AddWithValue("@txtnomecondutor", txtnomecondutor.Text);
Command.Parameters.AddWithValue("@txtpessoavisitar", txtpessoavisitar.Text);
Command.Parameters.AddWithValue("@txtncartao", txtncartao.Text);
Command.Parameters.AddWithValue("@data", DateTime.Now.ToString("yyyy-MM-dd"));
Command.Parameters.AddWithValue("@horas", DateTime.Now.ToString("hh:mm:ss"));
Command.Parameters.AddWithValue("@txtobs", txtobs.Text);
MySqlDataAdapter sda = new MySqlDataAdapter();
DataTable dt = new DataTable();
sda.SelectCommand = Command;
sda.Fill(dt);
}
}
if(chkhoraentrada.Checked)
{
DialogResult dr = MessageBox.Show("Deseja mesmo gravar estas alterações?", "Confirmação", MessageBoxButtons.YesNo,
MessageBoxIcon.Information);
if (dr == DialogResult.Yes)
{
string con = "server=localhost;userid=root;password=12345;persistsecurityinfo=True;database=portaria";
string query = "Insert into entradas(id_veiculo,empresa_visitante,empresa_visitar,nome_condutor,visitado,ncartao,data,hora,obs) values('" + msktxtmat.Text + "','" + txtempvis.Text + "','" + comboBox1.SelectedText + "', '" + txtnomecondutor.Text + "','" + txtpessoavisitar.Text + "', '" + txtncartao.Text + "', '" + DateTime.Now.ToString("yyyy-MM-dd") + "', '" + dateTimePicker1.Text + "','" + txtobs.Text + "');";
MySqlConnection Con = new MySqlConnection(con);
MySqlCommand Command = new MySqlCommand(query, Con);
MySqlDataAdapter sda = new MySqlDataAdapter();
DataTable dt = new DataTable();
sda.SelectCommand = Command;
sda.Fill(dt);
}
}
else
{
DialogResult dr = MessageBox.Show("Deseja mesmo gravar estas alterações?", "Confirmação", MessageBoxButtons.YesNo,
MessageBoxIcon.Information);
if (dr == DialogResult.Yes)
{
string con = "server=localhost;userid=root;password=12345;persistsecurityinfo=True;database=portaria";
string query = "Insert into entradas(id_veiculo,empresa_visitante,empresa_visitar,nome_condutor,visitado,ncartao,data,hora,obs) values('" + msktxtmat.Text + "','" + txtempvis.Text + "','" + comboBox1.SelectedText + "', '" + txtnomecondutor.Text + "','" + txtpessoavisitar.Text + "', '" + txtncartao.Text + "', '" + DateTime.Now.ToString("yyyy-MM-dd") + "', '" + dateTimePicker1.Text + "','" + txtobs.Text + "');";
MySqlConnection Con = new MySqlConnection(con);
MySqlCommand Command = new MySqlCommand(query, Con);
MySqlDataAdapter sda = new MySqlDataAdapter();
DataTable dt = new DataTable();
sda.SelectCommand = Command;
sda.Fill(dt);
}
}
}
private void button2_Click(object sender, EventArgs e)
{
this.Close();
}
}
}
What I have tried:
Tried to use dataset on combobox to define the default value and the shown data.
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