当我尝试将数据插入数据库时，会出现此错误

System.Data.SqlClient.Sqlexception(0x80131904):System.Data.SqlClient.SqlConnection中的“Name”附近语法不正确。

System.Data.SqlClient.SqlInternalConnection.OnError（SqlCeption exception，Boolean breakConnection，Action1WrapCloseInAction）位于System.Data.SqlClient.TdSparser.ThrowExceptionandWarning（TdsParserStateObject stateObj，Boolean callerHasConnectionLock，Boolean asyncClose）位于System.Data.SqlClient.TdSparser.TryRun（RunBehavior RunBehavior，SqlCommand cmdHandler，havior runBehavior，Boolean returnStream，String方法，TaskCompletionSource1完成，Int32超时，Task&；c:\users\IBTISAM TANVEER\Documents\Visual Studio 2012\website1\AddUser.aspx.cs:第53行ClientConnectionID:DF4AEC92-1F96-4236-9BD7-F802A52B5213错误号:102，状态:1，类:15

我的代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;

public partial class adduser : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            SqlConnection conec = new SqlConnection(ConfigurationManager.ConnectionStrings["DonorInformationConnectionString"].ConnectionString);
            conec.Open();
            string checkuserCNIC = "select count(*) from Donor where CNIC='" + TextBoxCNIC.Text + "'";
            SqlCommand com = new SqlCommand(checkuserCNIC,conec);
            int temp = Convert.ToInt32(com.ExecuteScalar().ToString());
            if (temp == 1)
            {
                Response.Write("User Already Exists");
            }

            conec.Close();
            
        }

    }
    protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            SqlConnection conec = new SqlConnection(ConfigurationManager.ConnectionStrings["DonorInformationConnectionString"].ConnectionString);
            conec.Open();
            string insertquerry = "insert into Donor(First Name, Last Name, Cell number, Email, CNIC, City, Address, Blood Group, Gender, Password) values (@firstname, @lastname, @cell, @email, @cnic, @city, @address, @blood, @sex, @password)";
            SqlCommand com = new SqlCommand(insertquerry, conec);
            com.Parameters.AddWithValue("@firstname", TextBoxFirst_Name.Text);
            com.Parameters.AddWithValue("@lastname", TextBoxLast_Name.Text);
            com.Parameters.AddWithValue("@cell", TextBoxPhone.Text);
            com.Parameters.AddWithValue("@email", TextBox_Email.Text);
            com.Parameters.AddWithValue("@cnic", TextBoxCNIC.Text);
            com.Parameters.AddWithValue("@city", DropDownList_City.SelectedItem.ToString());
            com.Parameters.AddWithValue("address", TextBox_Address.Text);
            com.Parameters.AddWithValue("@blood", DropDownListBloodGroup.SelectedItem.ToString());
            com.Parameters.AddWithValue("@sex", DropDownList_Gender.SelectedItem.ToString());
            com.Parameters.AddWithValue("@password", TextBoxCNIC.Text);
            com.ExecuteNonQuery();
            Response.Write("Donor Added Successfully");
            conec.Close();
        }
        catch(Exception ex)
        {
            Response.Write("There is some Errors Please Read------------------>" + ex.ToString());
        }

            
    }
    protected void DropDownList_Gender_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
}