int a = int.Parse(ds.Tables[0].Rows[0].ToString());输入字符串的格式不正确。
string sql;
string sql1;
string CNumber = txtCNumber.Text;
string CAmount = txtCAmount.Text;
string sql2 = "select CAmount from Cargo where CNumber ='" + CNumber + "'";
int b = int.Parse(CAmount);
string sql3 = "Data Source =BOB;Initial Catalog = DepotManagement; Integrated Security = SSPI";
SqlConnection cnn = new SqlConnection(sql3);
cnn.Open();
SqlDataAdapter da = new SqlDataAdapter(sql2,sql3);
SqlCommand cmd = new SqlCommand(sql2, cnn);
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds);
int a = int.Parse(ds.Tables[0].Rows[0].ToString());(这行报错,输入字符串的格式不正确。)