Index (zero based) must be greater than or equal to zero

Question

Hey, I keep getting an error:

Index (zero-based) must be greater than or equal to zero and less than the size of the argument list.

My code:

OdbcCommand cmd = new OdbcCommand("SELECT FirstName, SecondName, Aboutme FROM User WHERE UserID=1", cn);

OdbcDataReader reader = cmd.ExecuteReader();

while (reader.Read())

{

    Name.Text = String.Format("{0} {1}", reader.GetString(0), reader.GetString(1));

    Aboutme.Text = String.Format("{2}", reader.GetString(0));

}

Answer 1

In this case, second String.Format is using {2} as the placeholder but you're only passing it in one argument, therefore you should use {0} instead.

Try changing this line of code:

String.Format("{2}", reader.GetString(0));

To this code:

String.Format("{0}", reader.GetString(2));

Answer 2

The error you are encountering is due to using the placeholder {2} in the String.Format method while only providing one argument. This mismatch causes the issue.

 To resolve this, adjust the placeholder to {0} since you are passing only one argument, reader.GetString(2), which corresponds to the Aboutme field (the third column in your SQL query). The revised code should be:

 String.Format(\0}\ reader.GetString(2))

ensuring alignment between the placeholder and the argument passed, thus rectifying the problem by correctly referencing the column and maintaining the appropriate Aboutme text formatting.