Forum Discussion
_Nexthop_
Jan 15, 2025Copper Contributor
Mysql connection error
Hello, I need help with a connection with C#. I have a database that I just dumped, the connection with the mysql.data tools was working perfectly, but after the dump I get this error: Unable to c...
UdhayarajanJ
Aug 05, 2025Copper Contributor
Hello!
That error usually appears when you're trying to read a column from a database result that has a NULL value (i.e., DBNull.Value) and trying to cast it directly to another type (like int, string, DateTime, etc.) without checking if it's null first.
Go to the line where the exception is thrown.
Identify the column being accessed from the reader (or data row).
Add a DBNull check before casting or converting.