How can we convert empty textox to NULL Value in asp.net

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Hello;

How can we convert the value of empty textbox to NULL value?
I want to store the data(NULL) from textbox to data base.
CODE:

if (TextBox11.Text == String.Empty)
{
    cmd.Parameters.Add("@p", SqlDbType.Float).Value = /* WHAT I WRITE HERE TO TAKE NULL FORM TEXTBOX TO STORE
                                                         IN DATABASE  */
}

This shows an error:
"Failed to convert parameter value from a String to a Double."

Please help me.

Posted 7-Mar-11 4:44am

Shagun Bansal

Updated 7-Mar-11 17:53pm

m@dhu

v4

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Sandeep Mewara · Answer 1 · 2011-03-07T05:03:00

Can you explain what are you trying here: Convert.DBNull.Equals(TextBox11.Text);
Surely, it does not look like what you intend to.

BTW, a simple VS Debugger would had told you the error line and error in itself is quite self-explanatory.

I want to store the data(NULL) from textbox to data base.
Try:

cmd.Parameters.Add("@p", SqlDbType.Float).Value = System.DBNull.Value;

rajivpande86 · Answer 2 · 2011-03-07T10:20:00

Or you can also go the other way -

SQL

if (!String.IsNullorEmpty(TextBox11.Text))
{
      cmd.Parameters.Add("@p", SqlDbType.Float).Value = TextBox11.Text.Trim();
}

When the textbox1 is empty, this parameter won't be passed simply and your database will have NULL, as per your need.

HTH -
Rajeev

Please vote and mark the answer as accepted if this helps you.

Sreejith Gopinathan · Answer 3 · 2011-03-07T17:12:00

Solution 3

You can try

<code>
cmd.Parameters.AddWithValue("@p", (TextBox11.Text.Trim() == string.Empty) ?
                DBNull.Value :  (object)TextBox11.Text.Trim());

</code>

Posted 7-Mar-11 17:12pm

Sreejith Gopinathan

How can we convert empty textox to NULL Value in asp.net

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