C# - Add rows to datagridview dynamically

Adding rows to a DataGridView dynamically in a C# WinForms application involves either binding the DataGridView to a data source (like a DataTable, List, etc.) or manually adding rows using the DataGridView.Rows.Add method. Here, We'll demonstrate both approaches.

1. Binding to a Data Source

Using a DataTable

This approach involves creating a DataTable, adding it as the DataGridView's data source, and then dynamically adding rows to the DataTable.

Step-by-Step Example:

Initialize the Form and DataGridView:

using System; using System.Data; using System.Windows.Forms; namespace DynamicDataGridViewExample { public partial class MainForm : Form { private DataTable dataTable; public MainForm() { InitializeComponent(); InitializeDataGridView(); } private void InitializeDataGridView() { // Create a new DataGridView control and add it to the form DataGridView dataGridView = new DataGridView { Dock = DockStyle.Fill, AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill }; this.Controls.Add(dataGridView); // Create and configure the DataTable dataTable = new DataTable(); dataTable.Columns.Add("ID", typeof(int)); dataTable.Columns.Add("Name", typeof(string)); dataTable.Columns.Add("Age", typeof(int)); // Set the DataGridView's DataSource to the DataTable dataGridView.DataSource = dataTable; // Add initial rows to the DataTable AddRowToDataTable(1, "John Doe", 30); AddRowToDataTable(2, "Jane Smith", 25); } private void AddRowToDataTable(int id, string name, int age) { dataTable.Rows.Add(id, name, age); } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new MainForm()); } } }

Dynamically Adding Rows:

private void AddRowToDataTable(int id, string name, int age) { dataTable.Rows.Add(id, name, age); }

2. Adding Rows Manually

This approach involves manually adding rows directly to the DataGridView using the Rows.Add method.

Step-by-Step Example:

Initialize the Form and DataGridView:

using System; using System.Windows.Forms; namespace DynamicDataGridViewExample { public partial class MainForm : Form { private DataGridView dataGridView; public MainForm() { InitializeComponent(); InitializeDataGridView(); } private void InitializeDataGridView() { // Create a new DataGridView control and add it to the form dataGridView = new DataGridView { Dock = DockStyle.Fill, AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill }; this.Controls.Add(dataGridView); // Add columns to the DataGridView dataGridView.Columns.Add("ID", "ID"); dataGridView.Columns.Add("Name", "Name"); dataGridView.Columns.Add("Age", "Age"); // Add initial rows to the DataGridView AddRowToDataGridView(1, "John Doe", 30); AddRowToDataGridView(2, "Jane Smith", 25); } private void AddRowToDataGridView(int id, string name, int age) { dataGridView.Rows.Add(id, name, age); } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new MainForm()); } } }

Dynamically Adding Rows:

private void AddRowToDataGridView(int id, string name, int age) { dataGridView.Rows.Add(id, name, age); }

Explanation

Binding to a Data Source:
- Create a DataTable and add columns to it.
- Set the DataGridView's DataSource property to the DataTable.
- Add rows to the DataTable using the Rows.Add method.
Manually Adding Rows:
- Create and configure the DataGridView control.
- Add columns directly to the DataGridView using the Columns.Add method.
- Add rows to the DataGridView using the Rows.Add method.

Both approaches allow you to dynamically add rows to a DataGridView, but binding to a DataTable provides more flexibility and is generally preferred for data-bound applications.

Examples

1. "C# Add rows to DataGridView programmatically"

Description: How to add rows to a DataGridView in C# by creating rows programmatically and then adding them to the DataGridView control.

// Create a new row DataGridViewRow row = new DataGridViewRow(); row.CreateCells(dataGridView1); // Set cell values row.Cells[0].Value = "Value 1"; row.Cells[1].Value = "Value 2"; // Add the row to DataGridView dataGridView1.Rows.Add(row);

2. "C# Add rows to DataGridView from a list"

Description: How to add multiple rows to a DataGridView from a list of objects.

List<string[]> data = new List<string[]> { new string[] { "Row1 Col1", "Row1 Col2" }, new string[] { "Row2 Col1", "Row2 Col2" } }; foreach (var item in data) { dataGridView1.Rows.Add(item); }

3. "C# Add rows to DataGridView with custom objects"

Description: Adding rows to a DataGridView using a list of custom objects.

public class Person { public string Name { get; set; } public int Age { get; set; } } // List of custom objects List<Person> people = new List<Person> { new Person { Name = "John", Age = 30 }, new Person { Name = "Jane", Age = 25 } }; // Add rows to DataGridView foreach (var person in people) { dataGridView1.Rows.Add(person.Name, person.Age); }

4. "C# Add rows to DataGridView from a DataTable"

Description: Adding rows to a DataGridView from a DataTable.

// Create a DataTable DataTable dt = new DataTable(); dt.Columns.Add("Name"); dt.Columns.Add("Age"); // Add rows to DataTable dt.Rows.Add("John", 30); dt.Rows.Add("Jane", 25); // Bind DataTable to DataGridView dataGridView1.DataSource = dt;

5. "C# Add rows to DataGridView with specific cell formatting"

Description: Adding rows to a DataGridView with cell formatting.

// Add a new row int rowIndex = dataGridView1.Rows.Add("John", 30); // Format cell dataGridView1.Rows[rowIndex].Cells[1].Style.BackColor = Color.Yellow;

6. "C# Add rows to DataGridView using data binding"

Description: Dynamically binding data to a DataGridView using a BindingSource.

// Create a BindingSource BindingSource bindingSource = new BindingSource(); // Create a list of objects List<Person> people = new List<Person> { new Person { Name = "John", Age = 30 }, new Person { Name = "Jane", Age = 25 } }; // Set the data source bindingSource.DataSource = people; // Bind BindingSource to DataGridView dataGridView1.DataSource = bindingSource;

7. "C# Add rows to DataGridView with editable cells"

Description: Adding rows to a DataGridView and making cells editable.

// Create a new row int rowIndex = dataGridView1.Rows.Add("John", 30); // Set the cells to be editable dataGridView1.Columns[0].ReadOnly = false; dataGridView1.Columns[1].ReadOnly = false;

8. "C# Add rows to DataGridView with error checking"

Description: Adding rows to a DataGridView with error checking for empty values.

// Example values string name = "John"; int age = 30; if (!string.IsNullOrEmpty(name) && age > 0) { dataGridView1.Rows.Add(name, age); } else { MessageBox.Show("Invalid data"); }

9. "C# Add rows to DataGridView on button click"

Description: Adding rows to a DataGridView when a button is clicked.

private void buttonAddRow_Click(object sender, EventArgs e) { string name = textBoxName.Text; int age = int.Parse(textBoxAge.Text); dataGridView1.Rows.Add(name, age); }

10. "C# Add rows to DataGridView with default values"

Description: Adding rows to a DataGridView with default values if no input is provided.

// Default values string defaultName = "Unknown"; int defaultAge = 0; // Add row with default values dataGridView1.Rows.Add(defaultName, defaultAge);

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