c# - Is it possible to Pass Empty Parameter to sql server from code behind? -

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I have some parameters in the SQL query that only accept the 'value' which does not consider it blank, 'How is this value as a parameter, my code below which I am trying to do? 

  param = new SqlParameter ("@ CodeNumber", SqlDbType.VarChar); If (! String.IsNullOrEmpty (SearchCriteria.CodeNumber)) {param.Value = SearchCriteria.CodeNumber; } And {param.Value = DBNull.Value; //param.Value = ''; I want to do something like this} CMD. Parameter. Add (Ultimate); Ultimate = new escappamator ("@ Licensed", SqlDbType.DateTime); If (Search Certification .License Date! = Null & amp; Search Calculator. License Date! = Default (Datetime)) {param.Value = SearchCriteria.LicenseDate; } And {param.Value = DBNull.Value; //param.Value = ''; I want to do something like this} CMD. Parameter. Add (Ultimate);   
 I have not received any error but in the query it is not taking it as ''   
 
 
 empty  string  as a parameter when the underlying field is  varchar  :  
  param = New SQLparator ("codenumber", SQLDB type worker); If (! String.IsNullOrEmpty (SearchCriteria.CodeNumber)) {param.Value = SearchCriteria.CodeNumber; } And {param.Value = String.Empty; } cmd.Parameters.Add (param);   
 For the  date format , the SQL server will treat the empty string in a  DateTime  column  1/1 / 1 9 00 12:00:00 AM,  as seen. Therefore, instead of the empty string, you can pass in the code like this in  DateTime , such as:  
  param = new SqlParameter ("@ LicenseDate") SqlDbType. Date Time); If (Search Certification .License Date! = Null & amp; Search Calculator. License Date! = Default (Datetime)) {param.Value = SearchCriteria.LicenseDate; } And {param.Value = new date time (1900,1,1,0,0,0)} cmd.Parameters.Add (param);

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