In this article I will explain with an example, how to delete DataGridView row on DELETE Key Press (Keyboard Key) in Windows Forms (WinForms) Application with C# and VB.Net.
 
 

Form Design

The Form consists of following control:
DataGridView – For displaying data.
Delete DataGridView Row on DELETE Key Press using C# and VB.Net
 
The DataGridView has been assigned with following event handler:

Events

KeyDown – For deleting records on DELETE key press.
Delete DataGridView Row on DELETE Key Press using C# and VB.Net
 
 

Namespaces

You will need to import the following namespaces.
C#
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
 
VB.Net
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
 
 

Binding DataGridView in C# and VB.Net

Inside the Form Load event handler, columns are added to the DataGridView and the BindGrid method is called.
 

BindGrid

Inside the BindGrid method, records are fetched from Customers table and DataGridView is populated.
Note: For more details on how to bind DataGridView, please refer my article Bind (Fill) DataGridView in Windows Forms (WinForms) Application in C# and VB.Net.
 
Finally, the DataGridView MultiSelect property has been set with FALSE, so that user can’t select multiple rows.
C#
private void Form1_Load(object sender, EventArgs e)
{
    //Set AutoGenerateColumns False.
     dataGridView1.AutoGenerateColumns = false;
 
    //Set Columns Count.
    dataGridView1.ColumnCount = 3;
 
    //Add Columns.
    dataGridView1.Columns[0].Name = "CustomerId";
    dataGridView1.Columns[0].HeaderText = "Customer Id";
    dataGridView1.Columns[0].DataPropertyName = "CustomerId";
 
    dataGridView1.Columns[1].HeaderText = "Name";
    dataGridView1.Columns[1].Name = "Name";
    dataGridView1.Columns[1].DataPropertyName = "Name";
 
    dataGridView1.Columns[2].Name = "Country";
    dataGridView1.Columns[2].HeaderText = "Country";
    dataGridView1.Columns[2].DataPropertyName = "Country";
 
    this.BindGrid();
}
 
private void BindGrid()
{
    string sql = "SELECT CustomerId, Name, Country FROM Customers";
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter(sql, con))
        {
            using (DataTable dt = new DataTable())
            {
                sda.Fill(dt);
                dataGridView1.DataSource = dt;
                //Allow single row selection.
                dataGridView1.MultiSelect = false;
            }
        }
    }
}
 
VB.Net
Private Sub Form1_Load(ByVal  sender As Object, ByVal e As EventArgs) Handles MyBase.Load
    'Set AutoGenerateColumns False.
     dataGridView1.AutoGenerateColumns = False
 
    'Set Columns Count.
    dataGridView1.ColumnCount = 3
 
    'Add Columns.
    dataGridView1.Columns(0).Name = "CustomerId"
    dataGridView1.Columns(0).HeaderText = "Customer Id"
    dataGridView1.Columns(0).DataPropertyName = "CustomerId"
 
    dataGridView1.Columns(1).HeaderText = "Name"
    dataGridView1.Columns(1).Name = "Name"
    dataGridView1.Columns(1).DataPropertyName = "Name"
 
    dataGridView1.Columns(2).Name = "Country"
    dataGridView1.Columns(2).HeaderText = "Country"
    dataGridView1.Columns(2).DataPropertyName = "Country"
 
    Me.BindGrid()
End Sub
 
Private Sub BindGrid()
    dataGridView1.DataSource = Nothing
    Dim sql As String = "SELECT CustomerId, Name, Country FROM Customers"
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constr)
        Using sda As SqlDataAdapter = New SqlDataAdapter(sql, con)
            Using dt As DataTable = New DataTable()
                sda.Fill(dt)
                dataGridView1.DataSource = dt
                'Allow single row selection.
                 dataGridView1.MultiSelect = False
            End Using
        End Using
    End Using
End Sub
 
 

Deleting selected Row of DataGridView in C# and VB.Net

The DELETE operation will be performed on DELETE key press.
When the Delete key on keyboard is pressed, the DataGridView KeyDown event handler is executed.
Inside the KeyDown event handler, a check is performed if the user pressed the DELETE key and DeleteRow (explained later) method is called.
C#
private void OnKeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Delete)
    {
        this.DeleteRow();
    }
}
 
VB.Net
Private Sub OnKeyDown(sender As Object, e As KeyEventArgs) Handles dataGridView1.KeyDown
    If e.KeyCode = Keys.Delete Then
        Me.DeleteRow()
    End If
End Sub
 
 

DeleteRow

Inside the DeleteRow method, the selected DataGridView row is referenced and the CustomerId is fetched from the DataGridView row.
Then, the SqlCommand class object is created where the SQL query is passed to it and based on CustomerId the record is deleted using ExecuteNonQuery method.
Note: For more details on how to use ExecuteNonQuery function, please refer Understanding SqlCommand ExecuteNonQuery in C# and VB.Net.
 
Finally, if the record is deleted then, the row is removed from DataGridView Row collection using Remove method.
C#
private void DeleteRow()
{
    //Reference the selected DataGridView row.
    DataGridViewRow row = dataGridView1.SelectedRows[0];
 
    //Fetch the CustomerId from the DataGridView row.
    object customerId = row.Cells[0].Value;
 
    int deleted = 0;
    string sql = "DELETE FROM Customers WHERE CustomerId = @CustomerId";
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand(sql, con))
        {
            cmd.Parameters.AddWithValue("@CustomerId", customerId);
            con.Open();
            deleted = cmd.ExecuteNonQuery();
            con.Close();
        }
    }
 
    if (deleted > 0)
    {
        dataGridView1.Rows.Remove(row);
    }
}
 
VB.Net
Private Sub DeleteRow()
    'Reference the selected DataGridView row.
    Dim row As DataGridViewRow = dataGridView1.SelectedRows(0)
 
    'Fetch the CustomerId from the DataGridView row.
    Dim customerId As Object = row.Cells(0).Value
 
    Dim deleted As Integer = 0
    Dim sql As String = "DELETE FROM Customers WHERE CustomerId = @CustomerId"
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(constr)
        Using cmd As SqlCommand = New SqlCommand(sql, con)
            cmd.Parameters.AddWithValue("@CustomerId", customerId)
            con.Open()
            deleted = cmd.ExecuteNonQuery()
            con.Close()
        End Using
    End Using
 
    If  deleted > 0 Then
        dataGridView1.Rows.Remove(row)
    End If
End Sub
 
 

Screenshot

Delete DataGridView Row on DELETE Key Press using C# and VB.Net
 
 

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