Show username belong to selected item value from combobox

Satyapriyanayak
Posted by Satyapriyanayak under C# category on | Points: 40 | Views : 1109
Scenario
Fullname of user will be displayed in comboBox and when the user, select Fullname corresponding Username will be displayed in the Label control

Table User:
Firstname:
Lastname:
Username:
Password:
Email:
Notification

Combobox--> show Firstname + lastname

Label: Display username belong to selected item value from combo box.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace Firstname_lastname_combo_username
{
public partial class Form1 : Form
{
string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["dsn"];
OleDbCommand com;
OleDbDataAdapter oda;
DataSet ds;
string str;

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
comboBox1.Text = "Select";
OleDbConnection con = new OleDbConnection(ConnectionString);
con.Open();
str = "select * from emp";
com = new OleDbCommand(str, con);
oda = new OleDbDataAdapter(com);
ds = new DataSet();
oda.Fill(ds, "emp");
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
comboBox1.Items.Add(ds.Tables[0].Rows[i]["Firstname"] + ds.Tables[0].Rows[i]["Lastname"].ToString());
}
con.Close();
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
OleDbConnection con = new OleDbConnection(ConnectionString);
con.Open();
str = "select * from emp where Firstname+Lastname='" + comboBox1.SelectedItem + "'";
com = new OleDbCommand(str, con);
OleDbDataReader reader = com.ExecuteReader();
while (reader.Read())
{
label1.Text = reader["Username"].ToString();
}
reader.Close();
con.Close();
}
}
}

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