Assign Null value to the Integer Column in the DataTable

Question

I have a datatable with One ColumnName \"CustomerID\" with Integer DataType. Dynamically I want to add rows to the DataTable. For that, I had created one DataRow object like:

Answer 1

Int32 Temp = 0;
if !(Int32.TryParse(TextBox1.Text,Temp))
    DR["CustomerID"] = DBNull.Value
else
    DR["CustomerID"] = Temp

Answer 2

You can use DBNull.

DR["CustomerID"] = (TextBox.Text.Length == 0) ? Convert.ToInt32(TextBox1.Text) : DBNull.Value;

Answer 3

If you declare the Integer variable as int? it is automatically boxed by the C# compiler and you are able to assign null to that variable. For example:

int? custID = null;

I hope that helps

Answer 4

You need to check first

if (TextBox1.Text.Length > 0)
{
   DR["CustomerID"] = Convert.ToInt32(TextBox1.Text); 
}
else
{
  DR["CustomerID"] = null;  
}

Answer 5

When null is not allowed to be inserted into DR["CustomerID"], you could use (int?)null instead like this:

DR["CustomerID"] = string.IsNullOrEmpty(TextBox1.Text) ?
(int?) null : Convert.ToInt32(TextBox1.Text);