Upgrade VS2005 To 2008 And CE3.01 To 3.5 : Different Data Types Woes

Hi,
I am having the following problem AFTER converting to VS2008 from VS2005 and SQLCE 3.5 from 3.01:
SQL CE 3.5 db file has a table called Court0 with various columns of type float. I populate the values by copying floats from another table/tables. I do this via ado.net using this code snippet:

foreach (DataColumn column in this.mycourtsDataSet1.Tables[tableName].Columns)
{
string columnName = column.ColumnName.ToString();
string columnValue = aRow[0][columnName].ToString();
object cValue = aRow[0][columnName];

if (columnName.Remove(1) == "T" && !string.IsNullOrEmpty(columnValue))
{
// Add the value to the Court0 table.
DataRow[] bRow = this.mycourtsDataSet1.Tables["Court0"].Select("BookingPeriod = '" + columnName + "'");
if (bRow.Length > 0)
{
double colValue = Convert.ToDouble(cValue);
//bRow[0][tableName] = Convert.ToInt32(columnValue);
========> bRow[0][tableName] = colValue; <==== colValue is '1055.01'
}
}
}
}
This works fine in VS2005/CE3.01 BUT not in VS2008/CE3.5
In CE3.5, the value entered into the cell looses it's decimal value.
For example, '1055.01' becomes '1055.0' in CE3.5 .
Can someone explain to me why the conversion stuffs up in CE3.5 and what do I do to fix it.
Thanks,