Rows cannot be programmatically added to the datagridview’s row collection when the control is data-bound

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It appears as though you are using the DataSource property of the DataGridView. When this property is used to bind to data you cannot explicitly add rows directly to the DataGridView. You must instead add rows directy to your data source.

For example if your data source is a DataTable, using the DataTable that is assigned to the DataSource property (untested):

private void AddARow(DataTable table)
{
    // Use the NewRow method to create a DataRow with 
    // the table's schema.
    DataRow newRow = table.NewRow();

    // Add the row to the rows collection.
    table.Rows.Add(newRow);
}

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