Actually, I am working on a Windows application and I want to add inkPicture
to capture users signatures to the database. The signature column data type is varbinary
. The problem is that the record is added to the database but it shows it as null only.
This is what I have done so far:
string con = "Data Source=SAIUNIFLOW;Initial Catalog=documentfollowup;Integrated Security=True";
byte[] saveInk = (byte[])axInkPicture1.Ink.Save(InkPersistenceFormat.IPF_GIF, InkPersistenceCompressionMode.IPCM_Default);
cmdDatabase = new SqlCommand();
cmdDatabase.Connection = conDatabase;
// cmdDatabase.CommandText = "insert into manage (Signature) values(Singature); ";
cmdDatabase.CommandText= "insert into manage (Signature)" + "values('" + axInkPicture1 + "'); ";
cmdDatabase.Parameters.AddWithValue("@Signature", saveInk);
I'm using tablet for getting the signatures but when I click the insert button, I receive that error:
Cannot insert the null value into column Signature, table doesn't allow nulls.
Hopefully to help me to solve this error.
The problem is that you don't set the value of @Signature
parameter. And also try setting the SqlDbType
property of the parameter.
Use this instead:
cmdDatabase.CommandText= "insert into manage (Signature) values(@Signature);";
var signatureParam = cmdDatabase.Parameters.AddWithValue("@Signature", saveInk);
signatureParam.SqlDbType = SqlDbType.VarBinary;
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