String was not recognized as a valid DateTime error on Convert.ToDateTime

I loading values from the database to a dataset.  When there is a null in the datetime column, the FormatException  is thrown - String was not recognized as a valid DateTime.  How do I handle this problem in the following method.

 public dsInventory PopulateClass(DataSet ds)
        {
            DataTable dt = new DataTable();
            dt = ds.Tables[0];
            dsInventory dsI = new dsInventory();
            foreach (DataRow dtrow in dt.Rows)
            {
                //Error on these lines when a null is available
                dsI.MtlDueDate = Convert.ToDateTime(dtrow["MtlDueDate"].ToString());
                dsI.MtlReceiptDate = Convert.ToDateTime(dtrow["MtlReceiptDate"].ToString());
                         

            }
            return dsI;
          }
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Angelp1ayConnect With a Mentor Commented:
Try instead just this :)
DateTime? dt = dtrow["MtlDueDate"] as DateTime?;

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ChloesDadCommented:
Use DBNull.Value.Equals on the object without converting it to a string.

Here's an example:
   if (! DBNull.Value.Equals(row[fieldName]))
   {
      //not null
   }
   else
   {
      //null
   }
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Angelp1ayCommented:
If you want your field to be a plain DateTime instead of the Nullable DateTime (DateTime?) I proposed then you need to do what ChloesDad said and probably want to set your field to DateTime.MinValue.

Personally I think DateTime? represents your data semantics more correctly.
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anarki_jimbelCommented:
First, you may need to check values for DbNull:

if (row["myCol"] != DBNull.Value)
{
         ... //some code
}
else
{

}

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In 'else' you may set your dateTime value to DateTime.MinValue or DateTime.MaxValue instead.

Other option would be to use Nullable of DateTime.
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Monica PSoftware DeveloperCommented:
Declaring as like below ., will accept the nothing in date field
Try like this in your code and check
 
 Dim DOB As Nullable(Of Date) = Date.Now
    DOB = Nothing

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