How do I populate a LiteDB database if some of my values are null - litedb

Question

I am populating a dataGridView from an incomplete excel spreadsheet and generating the LiteDB from the dataGridView. Before the recent update, I wasn't having any issues. Now I am getting the error 'Objects cannot be cast from DBNull to other types'. I can work around this by including dummy values in the original spreadsheet. But ultimately we need to see what information we're missing. How can I accomplish this?
public void CreateDatabase()
{
using (var db = new LiteDatabase(#"C:\Users\BThatcher\Documents\_Personal\Revit\MDL-Sheets\SheetDatabase04.db")) //< ----------------
{
var sheets = db.GetCollection<Sheet>("sheets");
foreach (DataGridViewRow row in dataGridView2.Rows)
{
var sheet = new Sheet
{
SheetSequence = Convert.ToInt32(row.Cells[0].Value),
SheetNumber = row.Cells[1].Value.ToString(),
SheetName = row.Cells[2].Value.ToString(),
AreaNumber = Convert.ToInt32(row.Cells[3].Value),
AreaName = row.Cells[4].Value.ToString(),
SheetDiscipline = row.Cells[5].Value.ToString(),
DisciplineSort = Convert.ToInt32(row.Cells[6].Value),
SheetSort = Convert.ToInt32(row.Cells[7].Value),
ModelName = row.Cells[8].Value.ToString(),
AppearsInSheetlist = row.Cells[9].Value.ToString(),
DesignedBy = row.Cells[10].Value.ToString(),
DrawnBy = row.Cells[11].Value.ToString(),
CheckedBy = row.Cells[12].Value.ToString(),
ApprovedBy = row.Cells[13].Value.ToString(),
SheetTotal = Convert.ToInt32(row.Cells[14].Value),
DesignSoftware = row.Cells[15].Value.ToString(),
HasPdf = row.Cells[16].Value.ToString(),
PdfPath = row.Cells[17].Value.ToString(),
};
sheets.Insert(sheet);
this.Close();
}
}
}

Answer 1

This error are not from LiteDB (there is no DBNull in LiteDB). It's possible this DBNull are getting from row.Cells[n].Value when you try to convert.
LiteDB support nulls and nullable values (like int?).