Return only the changed rows of a datagridview?

Question

I have a winform that contains a datagridview. The form is totally disconnected from the data. The codebehind calls a webservice, which returns a table. That table becomes the datasource for the datagridview. Once the datagridview is displayed, a user can edit any row. Currently, when they hit the 'Update' button, every row in the grid is returned.

Is there a way to return only the changed rows in the datagridview?

UPDATE: Based off Tezzo's answer below, I was able to do this:

var changedRows = ((DataTable)dataGridView1.DataSource).GetChanges(DataRowState.Modified).Rows;

Answer 1

You can retrieve changes in a DataTable using GetChanges .

So you can use this code with a DataGridView :

CType(YourDataGridView.DataSource, DataTable).GetChanges(DataRowState.Modified).Rows

Answer 2

I have come up with a working solution in C# where I account for a user editing the current cell then performing a Save/Update without moving out of the edited row. The call to GetChanges() won't recognize the current edited row due to its RowState still being marked as " Unchanged ". I also make a call to move to the next row in case the user stayed on the current cell being edited as GetChange() won't touch the last edited cell.

//Move to previous cell of current edited row in case user did not move from last edited cell
dgvMyDataGridView.CurrentCell = dgvMyDataGridView.Rows[dgvMyDataGridView.CurrentCell.RowIndex].Cells[dgvMyDataGridView.CurrentCell.ColumnIndex - 1];

//Attempts to end the current edit of dgvMyDataGridView for row being edited
BindingContext[dgvMyDataGridView.DataSource, dgvMyDataGridView.DataMember.ToString()].EndCurrentEdit();

//Move to next row in case user did not move from last edited row
dgvMyDataGridView.CurrentCell = dgvMyDataGridView.Rows[dgvMyDataGridView.CurrentCell.RowIndex + 1].Cells[0];

//Get all row changes from embedded DataTable of DataGridView's DataSource
DataTable changedRows = ((DataTable)((BindingSource)dgvMyDataGridView.DataSource).DataSource).GetChanges();

foreach (DataRow row in changedRows.Rows)
{
        //row["columnName"].ToString();
        //row[0].ToString();
       //row[1].ToString();
}

Answer 3

Here is a simple way to get all rows which have been modified in a DataGridView using C#:

 DataRowCollection modifiedRows = ((DataTable)YourGridView.DataSource).GetChanges(DataRowState.Modified).Rows;