.Net C# 输入字符串的格式不正确。尝试将值插入 SQL Server 数据库

这是我的 C# 代码：

protected void UpdateProduct(object sender, GridViewUpdateEventArgs e) // ⇦ Gridview products update event
{
    string Tax = (GridViewProducts.Rows[e.RowIndex].FindControl("EditTaxDropDown") as DropDownList).SelectedItem.Value;
    string Type = (GridViewProducts.Rows[e.RowIndex].FindControl("EditTypeDropDown") as DropDownList).SelectedItem.Value;
    string Id = GridViewProducts.DataKeys[e.RowIndex].Value.ToString();
    string Name = (GridViewProducts.Rows[e.RowIndex].FindControl("TBName") as TextBox).Text;
    string Description = (GridViewProducts.Rows[e.RowIndex].FindControl("TBDescription") as TextBox).Text;
    string Price = (GridViewProducts.Rows[e.RowIndex].FindControl("TBPrice") as TextBox).Text;

    string SerialNumber = (GridViewProducts.Rows[e.RowIndex].FindControl("TBSerialNumber") as TextBox).Text;

    string strConnString = ConfigurationManager.ConnectionStrings["RegistrationConnectionString"].ConnectionString;

    using (SqlConnection con = new SqlConnection(strConnString))
    {
        string query = "UPDATE Products SET  Name = @Name, Description = @Description, Price = @Price, type = @type, Tax = @Tax, SerialNumber = @SerialNumber, Meta_Modified = GETDATE() WHERE Id = @Id";

        using (SqlCommand cmd = new SqlCommand(query))
        {
            cmd.Connection = con;
            cmd.Parameters.AddWithValue("@Id", Id);
            cmd.Parameters.AddWithValue("@Tax", Tax);
            cmd.Parameters.AddWithValue("@Name", Name);
            cmd.Parameters.AddWithValue("@Description", Description);
            cmd.Parameters.AddWithValue("@Type", Type);
            cmd.Parameters.Add("@Price", SqlDbType.Int, 50).Value = Convert.ToInt32(Price);
            cmd.Parameters.AddWithValue("@SerialNumber", SerialNumber);

            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();

            GridViewProducts.EditIndex = -1;
            BindGridData();
            ProductGWBindData(); //refreshes gridview 
        }
    }
}

这是 HTML 标记：

<asp:TemplateField HeaderText="Price" SortExpression="Price" >   
    <ItemTemplate>   
         <asp:Label ID="TBPrice" runat="server" Text='<%# Eval("Price", "{0:C2}")%>'></asp:Label>     
    </ItemTemplate>
    <EditItemTemplate>   
         <asp:TextBox  TextMode="Number" step="0.01" ID="TBPrice" runat="server" Text='<%# Eval("Price")%>' ></asp:TextBox>   
    </EditItemTemplate>
</asp:TemplateField>`

如您所见，Price由于某种原因，我对value感兴趣，我不知道如何将 string 转换为 int，我认为这与十进制“step=0.01”有关，我可以传递整数，例如 1、2、3 ... 但不是十进制格式 1.00 , 2.00 , 3.01 ...

请帮助我尝试将各种字符串转换为 int :(