How to Hide a particular row in Silverlight DataGrid on Button Click..

If you have grid called fileGrid you can remove the row using the following:

private void RemoveFileGridRow(int rowIndex)
{
    for (int controlIndex = 0; controlIndex < fileGrid.Children.Count; controlIndex++)
    {

     UIElement control = fileGrid.Children[controlIndex];
     int currentRowIndex = (int)control.GetValue(Grid.RowProperty);
     if (currentRowIndex == rowIndex)
     {
         fileGrid.Children.RemoveAt(controlIndex--);


     }
     else if (currentRowIndex > rowIndex)
     {
         control.SetValue(Grid.RowProperty, currentRowIndex - 1);
     }
    }

    // lastly remove our row
    fileGrid.RowDefinitions.RemoveAt(rowIndex);
}

This will remove the row and reorder the rows after the deleted row.

Alternatively, if you want to hide it, you can set the height of the row to 0.