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Unable to cast object type 'Syatem.Int32' to type .System.String'.

Mike Eghtebas
on
421 Views
Last Modified: 2014-08-09
Here, I am reading values from a table. Reading int type fields give me problem.

At line 14, I am getting error stating: "Unable to cast object type 'Syatem.Int32' to type .System.String'."

Question: How can I handle this.

Thank you.
public string ReadCriteria(string dataPoint)
    {
        string criteria = "";
        using (cn = SetConnection())
        {
            command.CommandText = "SELECT Top 1 [" + dataPoint + "] From RodCtiteria";
            command.CommandType = CommandType.Text;
            cn.Open();
            SqlDataReader reader = command.ExecuteReader();
            if (reader.HasRows)
            {
                reader.Read();
                if (!reader.IsDBNull(0)) // instead of: reader.GetString(0) != "" MetricIdL
                    criteria = reader.GetString(0);   //*********************< error here
            }
            reader.Close();
        }
        return criteria;
    }

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