输入字符串不是日期时间的正确格式字符串

Question

using (SqlCommand sc = new SqlCommand("Purchase_Order_History", con))
{
    MessageBox.Show("Agya");
    sc.CommandType = CommandType.StoredProcedure;
    sc.Parameters.Add("@Invoice_no", SqlDbType.Int).Value = Convert.ToInt32(dgv.Rows[i].Cells["Column1"].Value);
    sc.Parameters.Add("@Date_of_Purchase", SqlDbType.Date).Value = Date_of_Purchase.Value.ToString("yyyy/MM/dd");
    sc.Parameters.Add("@Item_Name", SqlDbType.NVarChar).Value = dgv.Rows[i].Cells["Column2"].Value;
    sc.Parameters.Add("@Seller_Name", SqlDbType.NVarChar).Value = dgv.Rows[i].Cells["Column3"].Value;
    sc.Parameters.Add("@Company_Name", SqlDbType.NVarChar).Value = dgv.Rows[i].Cells["Column4"].Value;
    sc.Parameters.Add("@Quantity", SqlDbType.Int).Value = Convert.ToInt32(dgv.Rows[i].Cells["Column5"].Value);
    sc.Parameters.Add("@Unit_Price", SqlDbType.Int).Value = Convert.ToInt32(dgv.Rows[i].Cells["Column6"].Value);
    sc.Parameters.Add("@Total_Price", SqlDbType.Int).Value = Convert.ToInt32(dgv.Rows[i].Cells["Column7"].Value);
    sc.Parameters.Add("@Discount", SqlDbType.Int).Value = Convert.ToInt32(Discount.Text);
    sc.Parameters.Add("@Paid_Amount", SqlDbType.Int).Value = Convert.ToInt32(Paid_Amount.Text);
    sc.Parameters.Add("@Remaining", SqlDbType.Int).Value = Convert.ToInt32(lbl_Remaining.Text);
    sc.Parameters.Add("@Sub_Total", SqlDbType.Int).Value = Convert.ToInt32(lbl_Subtotal.Text);
    sc.Parameters.Add("@Total", SqlDbType.Int).Value = Convert.ToInt32(lbl_Total.Text);
    con.Open();
    sc.ExecuteNonQuery();
    con.Close();
}

I don't know what is happening here I am getting this exception Input String Was Not In a Correct Format

Answer 1

You are converting the date to a string with Date_of_Purchase.Value.ToString("yyyy/MM/dd") . But the parameter @Date_of_Purchase is of type SqlDbType.Date , not of a text type. Therefore, change the code line to

sc.Parameters.Add("@Date_of_Purchase", SqlDbType.Date).Value = Date_of_Purchase.Value;

(Assuming that Date_of_Purchase is a DateTime? and you checked that it is not null.)

Note: You cannot format a date when storing it in a date or date/time column. You have to format it when displaying it.