Null value in a parameter varbinary datatype

Question

How can I add a null value in a parameter varbinary datatype?

When I execute the following code:

using (SqlConnection myDatabaseConnection1 = new SqlConnection(myConnectionString.ConnectionString))
{
    using (SqlCommand mySqlCommand = new SqlCommand("INSERT INTO Employee(EmpName, Image) Values(@EmpName, @Image)", myDatabaseConnection1))
    {
        mySqlCommand.Parameters.AddWithValue("@EmpName", textBoxEmpName.Text);
        mySqlCommand.Parameters.AddWithValue("@Image", DBNull.Value);
        myDatabaseConnection1.Open();
        mySqlCommand.ExecuteNonQuery();
    }
}

I get the following System.Data.SqlClient.SqlException:

Implicit conversion from data type nvarchar to varbinary(max) is not allowed. Use the CONVERT function to run this query.

Answer 1

You can try something like this:-

cmd.Parameters.Add( "@Image", SqlDbType.VarBinary, -1 );

cmd.Parameters["@Image"].Value = DBNull.Value;