如何使用C＃将数据插入MS访问？

Question

I created a database in ms access, in the database I have a table with two columns, fist column is Name with Text data type, and the other column is Date with Date/time data type. and I want to insert values in the table, but it give this error for the month calendar

Data type mismatch in criteria expression.

string sqlQuery = "INSERT INTO register (`Name`,`Date`) values (?,?)";

using (OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=E:\DB.accdb"))
using (OleDbCommand cmd = new OleDbCommand(sqlQuery, conn))
{
    conn.Open();
    cmd.Parameters.AddWithValue("@Name", this.textBox1.Text);
    cmd.Parameters.AddWithValue("@Date", this.monthCalendar1.Text);
    cmd.ExecuteNonQuery();
}

Answer 1

and the other column is Date with Date/time data type

The problem is you try to insert this column a string which is this.monthCalendar1.Text . You need to pass the DateTime directly to it.

We don't know what this monthCalendar1 control exactly but it should have some SelectedDate property or something. If does not have, just parse this string to DateTime with DateTime.Parse or something.

Do not use AddWithValue method. It may generate unexpected and surprising results sometimes . Use Add method overloads to specify your parameter type and it's size.

Answer 2

从AddwithValue括号中删除