I fill datagridview rows programmatically but when I leave row it blank

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code is
dgShop.Rows[i].Cells[2].Value = ds1.Tables[0].Rows[0].ItemArray[0].ToString();
and then

C#

private void dgShop_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == 2 && e.RowIndex >= 0)
            {
                if (e.RowIndex == 0)
                {
                    dgShop.Rows[e.RowIndex].Cells[3].Value = "1";
                    dgShop.Rows[e.RowIndex].Cells[4].Value = dgShop.Rows[e.RowIndex].Cells[2].Value;
                }
                else
                {
                    dgShop.Rows[e.RowIndex].Cells[3].Value = (Convert.ToInt32(dgShop.Rows[e.RowIndex - 1].Cells[4].Value) + 1).ToString();
                    dgShop.Rows[e.RowIndex].Cells[4].Value = (Convert.ToInt32(dgShop.Rows[e.RowIndex].Cells[2].Value) + Convert.ToInt32(dgShop.Rows[e.RowIndex - 1].Cells[4].Value)).ToString();
                }

            }
        }

It done but it is automatic blank

Posted 21-Feb-15 6:48am

PRIYVRAT D

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Richard MacCutchan 21-Feb-15 13:31pm

Please edit your question and show exactly where the error occurs, and explain the precise details.

1 solution

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Daniel Pfeffer · Answer 1 · 2015-02-22T21:59:00

1. Does your XAML code contain a DataContext statement that references your VM?

XML

<window ...="">
    <grid>DataContext="{StaticResource vm}">
        <!-- more stuff goes here -->
    </grid>
</window>

2. Does your VM implement the INotifyPropertyChanged interface?

C++

class FooVM : INotifyPropertyChanged
{
    #region Implementation of INotifyPropertyChanged

    public event PropertyChangedEventHandler PropertyChanged;

    #endregion

    // more stuff goes here
}

3. After each change to dgShow, are you calling the PropertyChanged event handler with the XAML name of dgShow?

C#

//  call this with the property name after every change!
public void NotifyPropertyChanged(string propertyName = "")
{
    if (PropertyChanged != null)
        PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}

The XAML model separates the display model from the underlying data model. Not only must the data model be notified when the display is changed, but the display must be notified when the data model is changed.