Cannot find column [MyDate].

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C#

Hi I want to compare the data entered in a textbox to the data I have in DataTable but I am getting this error: Cannot find column [Date].
T-Sql code:

ALTER PROC [dbo].[getCreditCard]

AS
BEGIN
   IF NOT EXISTS(SELECT CardNumber,NameOnCard,ExpiresEnd As MyDate FROM  [dbo].[CardBank] )
       begin
         PRINT N'Request failed!'
         return 0
       end
       else
       begin
          select * from [dbo].[CardBank]
          PRINT N'Request succeeded'
          return 1
        end
END

and c# code:

DataTable dt = _CreditCardInfo.GetCreditCard().Tables[0];
       _CreditCardInfo.CardNumber = TextBoxCardNumber.Text.Trim();
       string dropDowlistYear = DropDownListYears.SelectedValue;
       string dropDowlistMonth = DropDownListMonth.SelectedValue;
       DataRow[] drCardNumber = dt.Select("CardNumber='" + TextBoxCardNumber.Text.ToString().Trim() + "'");
       DataRow[] drNameOnCard = dt.Select("NameOnCard='" + TextBoxNameOnCard.Text.ToString() + "'");
       DataRow[] drValidFrom = dt.Select("MyDate='" + dropDowlistYear + "/" + dropDowlistMonth + "'");
       //DataRow[] ExpiresEnd = dt.Select("ExpYear='" + dropDowlistMonth1 + "'");
       if (drCardNumber.Length > 0 && drNameOnCard.Length > 0 && drValidFrom.Length > 0)
       {
           Response.Redirect("Default.aspx");
       }
       else
       {
           LabelMessage.Text = "The Card name or Card Number are invalid.";
           LabelMessage.ForeColor = Color.Red;
           return;
       }

and this the code inside my class:

public DataSet GetCreditCard()
    {
        return SqlHelper.ExecuteDataset(SqlHelper.GetConnection(), "[getCreditCard]");
    }

As u can see I want to get it from Datatable.
Can someone help!