C# - Get value from DataGridViewCheckBoxCell

To get the value from a DataGridViewCheckBoxCell in a DataGridView, you need to access the cell's Value property, which represents the state of the checkbox (checked, unchecked, or indeterminate). Here's how you can do that:

Example Code

Here is a step-by-step example of how to retrieve the value from a DataGridViewCheckBoxCell:

1. Setup a DataGridView with DataGridViewCheckBoxColumn

using System; using System.Windows.Forms; public partial class MainForm : Form { public MainForm() { InitializeComponent(); // Initialize DataGridView and add a CheckBox column DataGridView dataGridView = new DataGridView(); dataGridView.Dock = DockStyle.Fill; DataGridViewCheckBoxColumn checkBoxColumn = new DataGridViewCheckBoxColumn(); checkBoxColumn.Name = "CheckBoxColumn"; checkBoxColumn.HeaderText = "Select"; dataGridView.Columns.Add(checkBoxColumn); // Add some rows dataGridView.Rows.Add(false); dataGridView.Rows.Add(true); Controls.Add(dataGridView); // Button to get CheckBoxCell value Button getValueButton = new Button(); getValueButton.Text = "Get CheckBox Value"; getValueButton.Click += GetValueButton_Click; Controls.Add(getValueButton); } private void GetValueButton_Click(object sender, EventArgs e) { DataGridView dataGridView = (DataGridView)Controls[0]; // Get the DataGridView int rowIndex = 0; // Row index to check int columnIndex = dataGridView.Columns["CheckBoxColumn"].Index; // Column index // Get the value from the CheckBoxCell DataGridViewCheckBoxCell checkBoxCell = (DataGridViewCheckBoxCell)dataGridView.Rows[rowIndex].Cells[columnIndex]; bool? isChecked = (bool?)checkBoxCell.Value; // Handle the value if (isChecked.HasValue) { MessageBox.Show($"Row {rowIndex} CheckBox Value: {isChecked.Value}"); } else { MessageBox.Show($"Row {rowIndex} CheckBox Value is null"); } } } 

Explanation

1. Setup:

   • A DataGridView is initialized with a DataGridViewCheckBoxColumn.
   • A button is added to retrieve the value from the CheckBoxCell.

2. Retrieve the Value:

   • Obtain the DataGridView instance and specify the row and column indices.
   • Use the Cells property of the DataGridViewRow to access the DataGridViewCheckBoxCell.
   • Cast the Cell to DataGridViewCheckBoxCell and get the Value property.
   • Value returns an object which should be cast to bool? to handle both checked (true), unchecked (false), and possibly null values.

Notes:

• bool?: The Value property of DataGridViewCheckBoxCell is of type object, and the actual type is bool? (nullable boolean). This accounts for possible null states (e.g., if the cell is not initialized).
• Exception Handling: Ensure you handle exceptions or invalid indices to avoid runtime errors.
• UI Thread: Make sure all UI operations are performed on the main UI thread.

This approach allows you to retrieve and work with the value of checkboxes in a DataGridView effectively.

Examples

1. "C# get value from a DataGridViewCheckBoxCell in a selected row"

   • Description: Retrieve the value from a DataGridViewCheckBoxCell in the currently selected row of a DataGridView.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); Button button = new Button { Text = "Get Value", Dock = DockStyle.Bottom }; button.Click += Button_Click; Controls.Add(button); // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(false); } private void Button_Click(object sender, EventArgs e) { if (dataGridView.SelectedRows.Count > 0) { var cell = (DataGridViewCheckBoxCell)dataGridView.SelectedRows[0].Cells[0]; bool value = Convert.ToBoolean(cell.Value); MessageBox.Show("Checked: " + value); } else { MessageBox.Show("No row selected."); } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

2. "C# get value from DataGridViewCheckBoxCell in a specific row and column"

   • Description: Retrieve the value from a DataGridViewCheckBoxCell located at a specific row and column.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 2, Dock = DockStyle.Fill }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[1].Name = "Name"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); Button button = new Button { Text = "Get Value", Dock = DockStyle.Bottom }; button.Click += Button_Click; Controls.Add(button); // Adding sample rows dataGridView.Rows.Add(true, "Row1"); dataGridView.Rows.Add(false, "Row2"); } private void Button_Click(object sender, EventArgs e) { int rowIndex = 1; // Example row index int columnIndex = 0; // Example column index if (rowIndex >= 0 && rowIndex < dataGridView.Rows.Count) { var cell = (DataGridViewCheckBoxCell)dataGridView.Rows[rowIndex].Cells[columnIndex]; bool value = Convert.ToBoolean(cell.Value); MessageBox.Show("Checked: " + value); } else { MessageBox.Show("Invalid row index."); } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

3. "C# check if a DataGridViewCheckBoxCell is checked or not"

   • Description: Determine if a DataGridViewCheckBoxCell is checked by inspecting its value.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); Button button = new Button { Text = "Check Status", Dock = DockStyle.Bottom }; button.Click += Button_Click; Controls.Add(button); // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(false); } private void Button_Click(object sender, EventArgs e) { int rowIndex = 0; // Example row index if (rowIndex >= 0 && rowIndex < dataGridView.Rows.Count) { var cell = (DataGridViewCheckBoxCell)dataGridView.Rows[rowIndex].Cells[0]; bool isChecked = Convert.ToBoolean(cell.Value); MessageBox.Show("Checked: " + isChecked); } else { MessageBox.Show("Invalid row index."); } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

4. "C# get value from DataGridViewCheckBoxCell in the current cell"

   • Description: Retrieve the value of a DataGridViewCheckBoxCell in the currently active cell.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); Button button = new Button { Text = "Get Current Cell Value", Dock = DockStyle.Bottom }; button.Click += Button_Click; Controls.Add(button); // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(false); } private void Button_Click(object sender, EventArgs e) { if (dataGridView.CurrentCell != null) { var cell = (DataGridViewCheckBoxCell)dataGridView.CurrentCell; bool value = Convert.ToBoolean(cell.Value); MessageBox.Show("Checked: " + value); } else { MessageBox.Show("No cell selected."); } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

5. "C# get value from DataGridViewCheckBoxCell in all rows"

   • Description: Retrieve values from DataGridViewCheckBoxCell across all rows and display them.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); Button button = new Button { Text = "Get All Values", Dock = DockStyle.Bottom }; button.Click += Button_Click; Controls.Add(button); // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(false); dataGridView.Rows.Add(true); } private void Button_Click(object sender, EventArgs e) { foreach (DataGridViewRow row in dataGridView.Rows) { if (row.Cells[0] is DataGridViewCheckBoxCell cell) { bool value = Convert.ToBoolean(cell.Value); Console.WriteLine("Row " + row.Index + ": " + value); } } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

6. "C# retrieve DataGridViewCheckBoxCell value on cell value changed event"

   • Description: Retrieve and handle the value of a DataGridViewCheckBoxCell when its value changes.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); dataGridView.CellValueChanged += DataGridView_CellValueChanged; // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(false); } private void DataGridView_CellValueChanged(object sender, DataGridViewCellEventArgs e) { if (e.ColumnIndex == 0 && e.RowIndex >= 0) { var cell = (DataGridViewCheckBoxCell)dataGridView[e.ColumnIndex, e.RowIndex]; bool value = Convert.ToBoolean(cell.Value); Console.WriteLine("Cell value changed to: " + value); } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

7. "C# check if DataGridViewCheckBoxCell is null before accessing"

   • Description: Safely check if a DataGridViewCheckBoxCell is null before accessing its value.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); Button button = new Button { Text = "Check Cell Value", Dock = DockStyle.Bottom }; button.Click += Button_Click; Controls.Add(button); // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(null); } private void Button_Click(object sender, EventArgs e) { int rowIndex = 1; // Example row index if (rowIndex >= 0 && rowIndex < dataGridView.Rows.Count) { var cell = dataGridView.Rows[rowIndex].Cells[0] as DataGridViewCheckBoxCell; if (cell != null && cell.Value != null) { bool value = Convert.ToBoolean(cell.Value); MessageBox.Show("Checked: " + value); } else { MessageBox.Show("Cell is null or empty."); } } else { MessageBox.Show("Invalid row index."); } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

8. "C# extract value from a DataGridViewCheckBoxCell in a DataGridView after sorting"

   • Description: Retrieve the value from a DataGridViewCheckBoxCell after the DataGridView has been sorted.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill, AllowUserToOrderColumns = true }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); Button button = new Button { Text = "Get Sorted Values", Dock = DockStyle.Bottom }; button.Click += Button_Click; Controls.Add(button); // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(false); dataGridView.Rows.Add(true); // Sorting dataGridView.Sort(dataGridView.Columns[0], System.ComponentModel.ListSortDirection.Ascending); } private void Button_Click(object sender, EventArgs e) { foreach (DataGridViewRow row in dataGridView.Rows) { if (row.Cells[0] is DataGridViewCheckBoxCell cell) { bool value = Convert.ToBoolean(cell.Value); Console.WriteLine("Row " + row.Index + ": " + value); } } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

9. "C# get value from DataGridViewCheckBoxCell in a DataGridView with editable cells"

   • Description: Retrieve the value from a DataGridViewCheckBoxCell in a DataGridView where cells are editable.
   • Code:

     using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill, AllowUserToAddRows = true }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); Button button = new Button { Text = "Get Editable Values", Dock = DockStyle.Bottom }; button.Click += Button_Click; Controls.Add(button); // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(false); } private void Button_Click(object sender, EventArgs e) { foreach (DataGridViewRow row in dataGridView.Rows) { if (row.Cells[0] is DataGridViewCheckBoxCell cell) { bool value = Convert.ToBoolean(cell.Value); Console.WriteLine("Row " + row.Index + ": " + value); } } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

10. "C# handle DataGridViewCheckBoxCell value changes during user interaction"

    • Description: Handle and respond to changes in DataGridViewCheckBoxCell values due to user interaction.
    • Code:

      using System; using System.Windows.Forms; class Program : Form { DataGridView dataGridView; public Program() { dataGridView = new DataGridView { ColumnCount = 1, Dock = DockStyle.Fill }; dataGridView.Columns[0].Name = "Check"; dataGridView.Columns[0].CellTemplate = new DataGridViewCheckBoxCell(); Controls.Add(dataGridView); dataGridView.CellValueChanged += DataGridView_CellValueChanged; // Adding sample rows dataGridView.Rows.Add(true); dataGridView.Rows.Add(false); } private void DataGridView_CellValueChanged(object sender, DataGridViewCellEventArgs e) { if (e.ColumnIndex == 0 && e.RowIndex >= 0) { var cell = (DataGridViewCheckBoxCell)dataGridView[e.ColumnIndex, e.RowIndex]; bool value = Convert.ToBoolean(cell.Value); MessageBox.Show("Cell value changed to: " + value); } } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Program()); } } 

---

More Tags

timing intentfilter master-pages slack-api android-fragments android-actionbar arraylist fetchxml rake floating-action-button

More Programming Questions

• Spring MVC - Hidden Field
• Spring MVC JSTL Configuration
• Unary Operators in C
• Get Random Elements form geometric distribution in Numpy
• PHP global and $GLOBALS: Accessing Global Variables Within A Function
• Maven Automated Deployment
• Case Rules For SQL Statements In MySQL
• Python local functions (contains the nonlocal keyword)
• How to use the ellipsis slicing syntax in Python?
• Searching for file in directories recursively in C#

More General chemistry Calculators

• Free Online Average Atomic Mass Calculator
• Free Online Chemical Name Calculator
• Free Online pKa Calculator
• Free Online Effective Nuclear Charge Calculator
• Free Online Molar Mass Calculator

More Trees & Forestry Calculators

• Free Online Tree Value Calculator
• Free Online Tree Height Calculator
• Free Online Tree Age Calculator
• Free Online Tree Diameter Calculator
• Free Online Basal Area Calculator

More Biochemistry Calculators

• Free Online Protein Solubility Calculator
• Free Online Calibration Curve Calculator
• Free Online Isoelectric Point Calculator
• Free Online Michaelis-Menten Equation Calculator
• Free Online Resuspension Calculator

More Various Measurements Units Calculators

• Free Online Speed Calculator
• Free Online Weight Calculator
• Free Online Mass Calculator
• Free Online Density Calculator
• Free Online Height Calculator