从C＃代码更新Ms-Access表时出错

Question

I am trying to update my Access table from a C# form. When I run the program it runs without any message but when I click on Update it breaks and gives the following error message:

Input string was not in a correct format.

ACCESS TABLE FIELDS:- ID(string), Name(string), Score(int)

Error Message :-

 public Form1()
 {
    InitializeComponent();
 }

 OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\Database3.accdb");

 public void UpdateRecord()
 {
        int score = Convert.ToInt32(textBox2.Text);
        **string command = "update score set Name= '"+textBox1.Text+"' , Score= '"+score+"' where ID= '"+textBox3.Text+"'  ";**
    OleDbCommand cmd = new OleDbCommand(command,conn);
    conn.Open();

    cmd.ExecuteNonQuery();

public void showData()
{
   string command = "Select * from score";
   OleDbCommand cmd = new OleDbCommand(command, conn);

   OleDbDataAdapter da = new OleDbDataAdapter(cmd);
   DataTable Table = new DataTable();
   da.Fill(Table);
   dataGridView1.DataSource = Table;
}

Answer 1

Score is an integer. You have quotes around it in your string, which is invalid. Try:

string id = textBox3.Text;
string command = "update score set Name= '"+textBox1.Text+"' , Score= "+textBox2.Text+" where ID= '"+id+"'  ";

I'd be concerned that you have no data validation in place. What if they don't enter a number in the text box? And why are you converting 'ID' to a integer when it's an string field?