What caused Row.State change from Unchanged to Modified

See more:

C#

DataGridView

Hi,

I made a test form that contains a DataGridView control. There is also a ToolStrip with a "Save" button on it. Below is the used code:

public partial class TestForm7 : Form
    {
        BindingSource bs;
        DataTable dt;
        SqlDataAdapter da;
        SqlCommandBuilder cb;

        public TestForm7()
        {
            InitializeComponent();
        }

        private void TestForm7_Load(object sender, EventArgs e)
        {
            da = new SqlDataAdapter("select * from Bills", AppConnections.GetSqlConnection());
            dt = new DataTable("Bills");
            cb = new SqlCommandBuilder(da);
            da.Fill(dt);
            bs = new BindingSource();
            bs.DataSource = dt;
            dataGridView1.DataSource = bs;
        }

        private void toolStripButtonSave_Click(object sender, EventArgs e)
        {
            DataRow dr = ((DataRowView)bs.Current).Row;
            DataGridViewCell currentCell = dataGridView1.CurrentCell as DataGridViewCell;
            if (currentCell.IsInEditMode)
            {
                dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
            }
            bs.EndEdit();
            da.Update(dt);
        }
    }

I witness an odd behavior of my DataGridView control that puzzles me.



The following pattern is OK:

The form opens, the first record gets current. The value of a target test cell is “a”. I change the value to “b”. Then without changing the record I move focus to another cell. Then I press ESC, which causes the value of my target test cell change back to its original value of “a”.

The described above is a default behavior in such cases.



The following order of actions causes me troubles:

The form opens, the first record gets current. The value of a target test cell is “a”. I change the value to “b” and click “Save” button. The record gets saved in a database. Then without changing the current cell I enter “c” to the cell and move focus to another cell in the same record. Now I expect that pressing ESC will return “b” as a cell value but that won’t happen!!! I can press ESC how many times I want but that’ll change nothing because for some unknown reason the Row.State changed from Unchanged to Modified.

Why is that? What causes Row.State change is value? That’s abnormal but I don’t know what to do. I need ESC to bring back the original value. Do you have any ideas how to achieve that?

I noticed that if after clicking “Save” button I change the current record and then return back to it carrying out the described above actions then everything will be all right.

Sergiy Vakshul