passing the data to the selected cell of datagridview

Question

I am working in winforms. In that, I have a datagridview . I have transferred the selected cell value to a new form, form2

But now I want to re-transfer the textbox value which is in form2 to the datagridview cell.

How can i do that?

On the form2 , along with label1 there is button1 and a textbox . I want that when the textbox is filled and button1 is pressed, it will transfer the text from the textbox to the cell which was selected.

I have used following code for this. The code of button_click event...

But an error occurs as follwing.

" object reference not set to instance of an object "

Answer 1

You do recreate the main form inside of form 2, which is probably not what you need. Change the code to this:

private void editToolStripMenuItem_Click(object sender, EventArgs e)
{
 form2 f2 = new form2();
 f2.label1.Text = dataGridView1.SelectedCells[0].Value.ToString();
 f2.ShowDialog();
 dataGridView1.SelectedCells[0].Value = f2.textBox1.Text;
}

private void button1_Click(object sender, EventArgs e)
{
    DialogResult = DialogResult.OK;
}

Answer 2

Design Properties of DataGridView dataGridView1.Modifiers = Public

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        using (var f = new Form2 { Owner = this})
        {
            f.valueFromSelectedCell = dataGridView1.SelectedCells[0].EditedFormattedValue.ToString();
            f.ShowDialog();
        }
    }
}


public partial class Form2 : Form
{
    public string valueFromSelectedCell { get; set; }
    public Form2()
    {
        InitializeComponent();
    }

    private void Form2_Load(object sender, EventArgs e)
    {
        textBox1.Text = valueFromSelectedCell;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Form1 f = this.Owner as Form1;
        var currentCell = f.dataGridView1.CurrentCell;
        f.dataGridView1[currentCell.ColumnIndex, currentCell.RowIndex].Value = textBox1.Text;
        Close();
    }
}