C# visual basic error decimal - mysql

Question

I have some problem in my code( in our sql database UnitPrice and TotalPrice data type decimal and when I want to add data I got this error
"error converting data type varchar to numeric"
my code:
#region EDIT RECORD
private bool EditRecord()
{
DataRow row = gridView1.GetDataRow(gridView1.FocusedRowHandle);
if (row == null) return false;
PopupChillers frm = new PopupChillers();
frm.InitData(this.FindForm(), gridControl3, gridView1, row);
bool ret = frm.ShowDialog() == DialogResult.OK;
if (ret)
{
row.ItemArray = frm.Row.ItemArray;
string DegiskenId;
DegiskenId = row[0].ToString();
#region Kaydet guncelle hata kontrolu
try
{
#region Guncelle
if (KayitSekli == "GUNCELLE")
{
string gsorgu = "UPDATE OrnekTbl SET ProjectName=#ProjectName,UnitPrice=#UnitPrice,TotalPrice=#TotalPrice WHERE ProjectName='" + DegiskenId + "'";
objSqlDataAdapter.UpdateCommand = new SqlCommand(gsorgu, objSqlConnection);
objSqlDataAdapter.UpdateCommand.Parameters.Add("#ProjectName", SqlDbType.VarChar).Value = row[0].ToString();
objSqlDataAdapter.UpdateCommand.Parameters.Add("#UnitPrice", SqlDbType.VarChar).Value = row[1].ToString();
objSqlDataAdapter.UpdateCommand.Parameters.Add("#TotalPrice", SqlDbType.VarChar).Value = row[2].ToString();
{
objSqlConnection.Open();
objSqlDataAdapter.UpdateCommand.ExecuteNonQuery();
}
objSqlConnection.Close();
}
#endregion
#region Kaydet
if (KayitSekli == "KAYDET")
{
string ksorgu = "INSERT INTO OrnekTBL (ProjectName,UnitPrice,TotalPrice) VALUES (#ProjectName,#UnitPrice,#TotalPrice)";
objSqlDataAdapter.InsertCommand = new SqlCommand(ksorgu, objSqlConnection);
objSqlDataAdapter.InsertCommand.Parameters.Add("#ProjectName", SqlDbType.VarChar).Value = row[0].ToString();
objSqlDataAdapter.InsertCommand.Parameters.Add("#UnitPrice", SqlDbType.VarChar).Value = row[1].ToString();
objSqlDataAdapter.InsertCommand.Parameters.Add("#TotalPrice", SqlDbType.VarChar).Value = row[2].ToString();
if (objSqlConnection.State == ConnectionState.Closed)
{
objSqlConnection.Open();
objSqlDataAdapter.InsertCommand.ExecuteNonQuery();
}
}
#endregion
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
objSqlConnection.Close();
}
#endregion
row.EndEdit();
}
return ret;
}
#endregion

Answer 1

The error message seems pretty clear. Take a look at your parameters:
objSqlDataAdapter.UpdateCommand.Parameters.Add("#UnitPrice", SqlDbType.VarChar).Value = row[1].ToString();
objSqlDataAdapter.UpdateCommand.Parameters.Add("#TotalPrice", SqlDbType.VarChar).Value = row[2].ToString();
You're explicitly declaring them as SqlDbType.VarChar. The field names, however, suggest that they are numeric values. (Money? Decimal?) The parameters need to match the data types of the columns. Perhaps something like this:
decimal unitPrice = 0;
if (!decimal.TryParse(row[1].ToString(), out unitPrice))
{
// TODO: Handle the error if it's not a valid decimal
}
objSqlDataAdapter.UpdateCommand.Parameters.Add("#UnitPrice", SqlDbType.Decimal).Value = unitPrice;