Object cannot be cast from dbnull to other types

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I am creating windows application using datagridview, I am getting error from cell values binding time.

C#

meters += Convert.ToDecimal(dataGridView1.Rows[i].Cells[1].Value);

What I have tried:

C#

Object cannot be cast from DBNull to other types.

Posted 23-Oct-16 6:41am

Boopalslm

Updated 23-Oct-16 6:56am

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Dave Kreskowiak · Answer 1 · 2016-10-23T06:54:00

Solution 2

You cannot convert a DbNull to anything else.

The solution is very simple. Check for DbNull before you try to convert the value to a decimal.

var value = dataGridView1.Rows[i].Cells[1].Value;
if (value != DbNull.Value)
{
    meters += Convert.ToDecimal(value);
}

Posted 23-Oct-16 6:54am

Dave Kreskowiak

Comments

Boopalslm 23-Oct-16 13:05pm

sir it's working good, thanks a lot.

Karthik_Mahalingam 27-Oct-16 2:50am

if it works, please close this post by marking it as answer.

Midi_Mick · Answer 2 · 2016-10-23T06:53:00

Yes, that error is absolutely correct. If the database has a null in it, the value returned is DbNull.Value. You have to check for it if there is the slightest possibility that one your values coming from the database has a null.

I wrote a small article a short time ago that has some helper extensions that DO check for DBNull. Take a look at the link below - they may help you.

Coping with DBNull[^]

onelopez · Answer 3 · 2016-10-23T06:56:00

apparently that record has a null value. database null get converted to a

C#

DBNull.Value

. You need to cast to a nullable decimal and then add it to your variable

C#

var d = (decimal?) dataGridView1.Rows[i].Cells[1]; 
meters += d.GetValueOrDefault(); // can do this
// or can do this too
if(d.HasValue){
    meters += d.Value;
}

Object cannot be cast from dbnull to other types

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