Open XML SDK 2.0 - how to update a cell in a spreadsheet?

Question

I want to update a cell in a spreadsheet that is used by a chart, using the Open XML SDK 2.0 (CTP). All the code samples I have found insert new cells. I am struggling with

Answer 1

var sheetData = new SheetData();
var row = UpdateCell("A","Hello World", 5);
sheetData.Append(row);
worksheet.Append(sheetData);

private static Row UpdateCell(string columnName, string value, int rowIndex)
{
       Row row = new Row { RowIndex = (uint)rowIndex };
       Cell  c1 = new TextCell(columnName, value, rowIndex);
       row.Append(c1);
       return row;            
}


public class TextCell : Cell
{
    public TextCell(string header, string text, int index)
    {
        this.DataType = CellValues.InlineString;
        this.CellReference = header + index;
        //Add text to the text cell.
        this.InlineString = new InlineString { Text = new Text { Text = text } };
    }
}