can't insert datetime type to sql database

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C#

ASP.NET

SQL-Server

Dear All,

I want to insert date using textbox and calendar extendar

Error :- The type datetime can't insert to table but other types inserted normally

My Example :

I have the following table columns :

userid (int & identity) | name (nvarchar(50)) | expdate (datetime)
-----------------------------------------------------------------

Stored Procedure code

ALTER PROCEDURE dbo.Manageusers
(

@name nvarchar(50),
@expdate  datetime

)

AS

   

INSERT INTO users (name,expdate) Values (@name,@expdate)

    END


    RETURN

- C# Class :

public class insertusers:opsMaintable 
{
 protected string ProcedureName;

    #region Fields

    private string _name;
     private  DateTime _expdate;
    

    #endregion

    #region Properties


    public string name
    {
        get
        {
            return _name;
        }
        set
        {
            _name = value;
        }
    }
     public DateTime expdate
    {
        get
        {
            return _expdate;
        }
        set
        {
            _expdate = value;
        }
    }

    #endregion

    //Insert & Delete & Update Method
    protected override bool LoadProperties2Parameters(string TypeofOperation)
    {
        SortedList SL = new SortedList();
       
        SL.Add("@name", name);
SL.Add("@expdate", expdate);
        


        ProcedureName = "Manageusers";
        if (db.RunProcedure(ProcedureName, SL) == 1)
            return true;
        else
            return false;
    }
}

- insert button code behind

 insertusers ingang = new insertusers();
ingang.name = Textuser.Text;
ingang.expdate =Convert.ToDateTime(Textdate.Text);

ingang.Add()