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

A null/empty string is in the wrong format; you would need to detect that scenario and compensate:

    DR["CustomerID"] = string.IsNullOrWhiteSpace(text)
        ? DBNull.Value : (object)Convert.ToInt32(text);

Answer 2

 if (TextBox1.Text.Trim() == String.Empty)
    {
        DR["CustomerID"] = null;
    }
    else
    {
        DR["CustomerID"] = Convert.ToInt32(TextBox1.Text);
    }

Answer 3

First of all, of course, the field needs to be set as nullable in the DB.

And then, set it to DBNull.Value

Answer 4

DataTable dt = new DataTable();
DataRow DR = dt.NewRow();

if (String.IsNullOrEmpty(TextBox1.Text))
    DR["CustomerID"] = DBNull.Value;
else
    DR["CustomerID"] = Convert.ToInt32(TextBox1.Text);

Answer 5

DR["CustomerID"] = !string.IsNullOrEmpty(TextBox1.Text)
                   ? Convert.ToInt32(TextBox1.Text)
                   : DBNull.Value;

But you should check also that the value is a valid integer:

int value;
if(int.TryParse(TextBox1.Text, out value))
{
    DR["CustomerID"] = value;
}
else
{
    DR["CustomerID"] = DBNull.Value;
}

Answer 6

you could do it like that:

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