Excel Empty Cell Value

I am reading in from and excel sheet, and placing into a string.
we shall say
ExcelString = (data from excel).

Does anyone know what the value of ExcelString is if the cell was empty?
I need this for comparison, and it is in a place in the app I can't even have it output it to the screen.
I know it is not "null"
I know it is not an empty string ""
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Again.... try DBNull.Value

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jj819430Author Commented:
I am trying to use it in an if statement.

if (ExcelString != DBNull.Value)
is not capturing it... it is weird because I would have thought it would be fine.
jj819430Author Commented:
I meant

if(ExcelString != Convert.ToString(DBNull.Value))
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Can you put more code?

How do you connect to excel? Using COM object or OLEDB?
jj819430Author Commented:
void ConnectandRead()
String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=C:\\Files\\" + filename + ";" +"Extended Properties='Excel 8.0; IMEX=1;'";
                  OleDbConnection objConn = new OleDbConnection(sConnectionString);


                  OleDbCommand objCmdSelect =new OleDbCommand("SELECT * FROM [Sheet1$]", objConn);
OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();
objAdapter1.SelectCommand = objCmdSelect;
DataSet objDataset1 = new DataSet();
objAdapter1.Fill(objDataset1, "XLData");


After this reading of the data, I put it in a datagrid for display and editing. I convert each one into string format (by force) in order to work with another neccessary

So I have it as string ExcelString = DataGridExcel.Items[1].Cells[0].Text

I am trying to figure out what is in ExcelString if the data read from the excel sheet was a null.
jj819430Author Commented:
Nevermind, got it on my own. It was == " " (I guess it changes it to a black space if it is null during the conversions.
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