Compare Old Cell and New cell values in datagridview

Question

I have a DataGridView. I have to compare the old and the new cell values and perform further action.

I tried comparing with Cell Leave , CellValidating events by using the following code,

private void TestGrid_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
    int currentCell = TestGrid.CurrentCell.ColumnIndex;
    var oldCellValue = TestGrid[e.ColumnIndex, e.RowIndex].Value;
    var newValue = e.FormattedValue;
}

It returns my Old value and new value both as eg: 1000 when I try clicking on the different cell.

Please, let me know if there is any other event through which I can achieve the desired behaviour. Also If I have to compare the old and new cells row or column indexes then how to proceed?

private void TestGrid_CellLeave(object sender, DataGridViewCellEventArgs e)
{
    int currentCell = TestGrid.CurrentCell.ColumnIndex;
    int oldCell = e.ColumnIndex;        
}

Both them returns same index.

Answer 1

Try with the EditedFormattedValue property of the DataGridView . Tested this one and I see the different values:

private void TestGrid_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
    int currentCell = TestGrid.CurrentCell.ColumnIndex;
    var oldValue = TestGrid[e.ColumnIndex, e.RowIndex].Value;
    var newValue = TestGrid[e.ColumnIndex, e.RowIndex].EditedFormattedValue;
    /* Perform some logic here*/
}

Answer 2

Try converting the cell values into strings and do something similar like this (code example comes from MSDN). Hope this helps.

// Iterate through the SelectedCells collection and sum up the values. 
for (counter = 0;
    counter < (DataGridView1.SelectedCells.Count); counter++)
{
    if (DataGridView1.SelectedCells[counter].FormattedValueType ==
        Type.GetType("System.String"))
    {
        string value = null;

        // If the cell contains a value that has not been commited, 
        // use the modified value. 
        if (DataGridView1.IsCurrentCellDirty == true)
        {

            value = DataGridView1.SelectedCells[counter]
                .EditedFormattedValue.ToString();
        }
        else
        {
            value = DataGridView1.SelectedCells[counter]
                .FormattedValue.ToString();
        }
        if (value != null)
        {
            // Ignore cells in the Description column. 
            if (DataGridView1.SelectedCells[counter].ColumnIndex !=
                DataGridView1.Columns["Description"].Index)
            {
                if (value.Length != 0)
                {
                    SelectedCellTotal += int.Parse(value);
                }
            }
        }
    }