[ask] Error pada visual C#

[Braincode]

gan,



ane coba bikin pengolahan data barang dengan visual C#.net nih gan....



tapi pas run, ane pencet tombol next atau prev kok jadi error gini gan...



ini gan tampilannya :




Spoiler for desain:







Spoiler for gambar:













Spoiler for codingnya:





Quote:





static void Main()

{

Application.Run(new Form1());

}



BindingManagerBase bmBarang;



private void Form1_Load (object sender, System.EventArgs e)

{

oleDbDataAdapter1.Fill(dataSet21);

bmBarang = this.BindingContext[dataSet21, "tbl_barang"];

}





private void menuItem2_Click(object sender, System.EventArgs e)

{

MessageBox.Show("Close This Program ?", "Close", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);

this.Close();

}



private void menuItem4_Click(object sender, System.EventArgs e)

{

MessageBox.Show("COBA _ COBA ", "About Pengolahan Stock Barang", MessageBoxButtons.OK, MessageBoxIcon.Information);

}



private void btnNext_Click(object sender, System.EventArgs e)

{

bmBarang.Position ++;

}



private void btnPrev_Click(object sender, System.EventArgs e)

{

bmBarang.Position --;

}





}

}














Spoiler for di run:















Spoiler for errror:
























kesalahannya di mana ya gan?? di database atau di coding nya ya gan???

Tolong bantuannya ya gan....



Thanks before gan,,,





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