Append Data in existing Gridview

To append data in an existing GridView control in ASP.NET, you can follow these steps:

1. Get the data you want to append to the GridView. This could be a single row or multiple rows of data.

2. Create a new DataTable object and add the columns that match the columns in your GridView.

3. Add the new data to the DataTable object as rows.

4. Merge the new DataTable with the existing DataTable of the GridView.

5. Bind the merged DataTable to the GridView.

Example:

// Get the new data to append
DataTable newDataTable = GetNewData();

// Create a new DataTable with matching columns
DataTable existingDataTable = ((DataView)gridView.DataSource).Table;
DataTable mergedDataTable = existingDataTable.Clone();

// Add new data to the DataTable
foreach (DataRow newRow in newDataTable.Rows)
{
    mergedDataTable.Rows.Add(newRow.ItemArray);
}

// Merge the new DataTable with the existing DataTable
foreach (DataRow existingRow in existingDataTable.Rows)
{
    mergedDataTable.ImportRow(existingRow);
}

// Bind the merged DataTable to the GridView
gridView.DataSource = mergedDataTable;
gridView.DataBind();