DataGridViewRowCollection.Add Method (Int32)


Adds the specified number of new rows to the collection.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public virtual int Add(
	int count


Type: System.Int32

The number of rows to add to the DataGridViewRowCollection.

Return Value

Type: System.Int32

The index of the last row that was added.

Exception Condition

count is less than 1.


The associated DataGridView control is performing one of the following actions that temporarily prevents new rows from being added:

  • Selecting all cells in the control.

  • Clearing the selection.


This method is being called from a handler for one of the following DataGridView events:


The DataSource property of the DataGridView is not null.


The DataGridView has no columns.


The row returned by the DataGridView.RowTemplate property has more cells than there are columns in the control.


This operation would add frozen rows after unfrozen rows.

The Add(Int32) method adds shared rows to the DataGridViewRowCollection. The new rows are based on the RowTemplate of the DataGridView. Be sure that the row specified in the RowTemplate property can be shared for best scalability. For more information, see Best Practices for Scaling the Windows Forms DataGridView Control.

Rows in the control are not automatically sorted when new rows are added. To sort new rows into their correct position, call the DataGridView.Sort method in a DataGridView.RowsAdded event handler. You might also want to call the DataGridView.Sort method in a CellValueChanged event handler to sort the rows when the user modifies a cell.

.NET Framework
Available since 2.0
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