How to Search Data in the DataGridView Using a ComboBox in C#

Submitted by janobe on Wednesday, November 7, 2018 - 19:17.
Searching data is very important most especially if you have a lot of data stored in the database. In this way, it will be easier for you to search the data that you need. So, in this tutorial, I will teach you how to search data in the datagridview using a combobox in c# and MySQL database. I based this on my last tutorial which is How to Fill Data in a ComboBox Using C# and MySQL Database because of their similar method. Let's get started.

Creating Database

Create a Database named “peopledb”. After that, execute the following query below for creating and adding the data in the table.
  1. CREATE TABLE `tbluser` (
  2.   `UserId` int(11) NOT NULL,
  3.   `Fullname` varchar(124) NOT NULL
  5.  
  6. --
  7. -- Dumping data for table `tbluser`
  8. --
  9.  
  10. INSERT INTO `tbluser` (`UserId`, `Fullname`) VALUES
  11. (3, 'Janno Palacios'),
  12. (4, 'Craig'),
  13. (7, 'cherry lou velez'),
  14. (8, 'velez lou'),
  15. (9, 'jom');

Creating Application

Step 1

Open Microsoft Visual Studio 2015 and create a new windows form application in c#. c#combo21

Step 2

Do the Form just like this. C#Combo12323421

Step 3

Add mysql.data.dll for your references.

Step 4

Go to the code editor and add using MySql.Data.MySqlClient; above the namespace to access MySQL library;

Step 5

Initialize the connection between mysql and c#. After that, declare all the classes and variables that are needed.
  1.   MySqlConnection con = new MySqlConnection("server=localhost;user id=root;password=janobe;database=peopledb;sslMode=none");
  2.   MySqlCommand cmd;
  3.   MySqlDataAdapter da;
  4.   DataTable dt;
  5.   string sql;

Step 6

Create a method for filling the data in the combobox.
  1.   private void LoadCombo(string sql,string DisplayMember,string ValueMember)
  2.         {
  3.             try
  4.             {
  5.                 con.Open();
  6.                 cmd = new MySqlCommand();
  7.                 cmd.Connection = con;
  8.                 cmd.CommandText = sql;
  9.                 da = new MySqlDataAdapter();
  10.                 da.SelectCommand = cmd;
  11.                 dt = new DataTable();
  12.                 da.Fill(dt);
  13.  
  14.                 comboBox1.DataSource = dt;
  15.                 comboBox1.DisplayMember = DisplayMember;
  16.                 comboBox1.ValueMember = ValueMember;
  17.  
  18.  
  19.  
  20.             }
  21.             catch(Exception ex)
  22.             {
  23.                 MessageBox.Show(ex.Message);
  24.  
  25.             }finally
  26.             {
  27.                 con.Close();
  28.                
  29.             }
  30.         }

Step 7

Create a method to display data in the datagridview.
  1.    private void LoadGrid(string sql, DataGridView dtg)
  2.         {
  3.             try
  4.             {
  5.                 con.Open();
  6.                 cmd = new MySqlCommand();
  7.                 cmd.Connection = con;
  8.                 cmd.CommandText = sql;
  9.                 da = new MySqlDataAdapter();
  10.                 da.SelectCommand = cmd;
  11.                 dt = new DataTable();
  12.                 da.Fill(dt);
  13.                 dtg.DataSource = dt;
  14.             }
  15.             catch (Exception ex)
  16.             {
  17.                 MessageBox.Show(ex.Message);
  18.             }
  19.             finally
  20.             {
  21.                 con.Close();
  22.             }
  23.         }

Step 8

Write this code for displaying data in the combobox and datagridview in the first load of the form.
  1.   private void Form1_Load(object sender, EventArgs e)
  2.         {
  3.             sql = "SELECT * FROM `tbluser`";
  4.             LoadCombo(sql, "Fullname", "UserId");
  5.  
  6.             sql = "SELECT * FROM `tbluser`";
  7.             LoadGrid (sql,dataGridView1 );
  8.         }

Step 9

Write the following codes for searching data using combobox in the datagridview.
  1. private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
  2.         {
  3.             sql = "SELECT * FROM `tbluser` WHERE UserId='" + comboBox1.SelectedValue  + "'";
  4.             LoadGrid(sql, dataGridView1);
  5.         }
For any questions about this article. You can contact me @ Email – [email protected] Mobile No. – 09305235027 – TNT Or feel free to comment below.
Tags
c#
searching data
combobox
MySQL Database

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