How we can apply restriction in picture box.

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I want When there is no Image is selected then Automaticly it Save Null Value to SQL database . I'm Using C#

What I have tried:

if (EmpolyPicpictureBox.Image != null)
           {
               //use to save image
               MemoryStream ms = new MemoryStream();
               EmpolyPicpictureBox.Image.Save(ms, EmpolyPicpictureBox.Image.RawFormat);
               byte[] iemimg = ms.GetBuffer();
               ms.Close();
               cmd.Parameters.AddWithValue("@Emimage", iemimg);

           }
           else
           {
               cmd.Parameters.AddWithValue("@Emimage", EmpolyPicpictureBox.Image = null);
           }

Posted 17-Mar-18 18:03pm

Fahid Zahoor

Updated 17-Mar-18 21:48pm

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OriginalGriff · Accepted Answer · 2018-03-17T20:51:00

Solution 1

Use DBNull.Value Field (System)[^]

else
{
    cmd.Parameters.AddWithValue("@Emimage", DBNull.Value);
}

Posted 17-Mar-18 20:51pm

OriginalGriff

Comments

Fahid Zahoor 18-Mar-18 11:52am

System.Data.SqlClient.SqlException: 'Operand type clash: nvarchar is incompatible with image'
This Error is Occur when i using DBNull.Value

OriginalGriff 18-Mar-18 12:09pm

Use the debugger to look at exactly what you are passing, and what the SQL command looks like.

Richard Deeming 19-Mar-18 12:56pm

cmd.Parameters.Add("@Emimage", SqlDbType.VarBinary).Value = DBNull.Value;

AddWithValue can't guess the type correctly if the value you give it is null.

Fahid Zahoor 19-Mar-18 13:48pm

Thanks It Will Runing.