Error in inserting record

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I want to insert record into database but getting Exception Failed to convert parameter value from a SqlParameter to a String.

i have taknen Sql Datatype Varchar

my code is given below

C#

public void AddstudentDetails(int SystemID, string StudentNumber, string FirstName,string MiddleName,string LastName,string address, string contact,string Email)
           {
               SqlConnection con = new SqlConnection();
               con.ConnectionString = ConfigurationManager.ConnectionStrings["smsysConnectionString"].ConnectionString;

               SqlCommand cmd = new SqlCommand();
               cmd.Connection = con;
               cmd.CommandText = "sp_AddStudentDetails";
               cmd.CommandType = CommandType.StoredProcedure;


               SqlParameter parameterSystemID = new SqlParameter("@SystemId",SqlDbType.Int,4);
               parameterSystemID.Value=SystemID;
               cmd.Parameters.Add(parameterSystemID);

               SqlParameter parameterStudentNumber = new SqlParameter("@StudentNumber", SqlDbType.VarChar, 50);
               parameterStudentNumber.Value = StudentNumber;
               cmd.Parameters.Add(parameterStudentNumber);

               SqlParameter parameterFirstName = new SqlParameter("@FirstName", SqlDbType.VarChar, 50);
               parameterFirstName.Value = FirstName;
               cmd.Parameters.Add(parameterFirstName);

               SqlParameter parameterMiddleName = new SqlParameter("@MiddleName", SqlDbType.VarChar, 50);
               parameterMiddleName.Value = MiddleName;
               cmd.Parameters.Add(parameterMiddleName);

               SqlParameter parameterLastName = new SqlParameter("@LastName", SqlDbType.VarChar, 50);
               parameterLastName.Value = parameterLastName;
               cmd.Parameters.Add(parameterLastName);

               SqlParameter parameterAddress = new SqlParameter("@Addresss", SqlDbType.VarChar, 50);
               parameterAddress.Value = address;
               cmd.Parameters.Add(parameterAddress);

               SqlParameter parameterContact = new SqlParameter("@Contact", SqlDbType.VarChar, 11);
               parameterContact.Value = contact;
               cmd.Parameters.Add(parameterContact);

               SqlParameter parameterEmail = new SqlParameter("@Email", SqlDbType.VarChar,50);
               parameterEmail.Value = Email;
               cmd.Parameters.Add(parameterEmail);

               try
               {
                   con.Open();
                   cmd.ExecuteNonQuery();
                   con.Close();
               }
               catch (Exception ex)
               {

               }
           }

Posted 1-Oct-13 21:33pm

Member 10310320

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tanweer 2-Oct-13 3:36am

what are the datatypes of these columns in database, will you please share here? right now i just guess that the StudentNumber may be int and you are supplying it as varchar, please check it again.

Member 10310320 2-Oct-13 3:38am

alter procedure sp_AddStudentDetails
@SystemID int=0,
@StudentNumber varchar(50),
@FirstName varchar(50),
@MiddleName varchar(50),
@LastName varchar(50),
@Address varchar(50),
@Contact varchar(11),
@Email varchar(50),
@StudentID int
As
Begin
if @StudentID=0
begin
insert into Students
(
SystemID,
StudentNumber,
FirstName,
MiddleName,
LastName,
Address,
Contact,
Email
)
values (
@SystemID,
@StudentNumber,
@FirstName,
@MiddleName,
@LastName,
@Address,
@Contact,
@Email
)
set @studentID=@@IDENTITY
End
else
begin
update Students set SystemID=@SystemID,
StudentNumber=@StudentNumber,
FirstName=@FirstName,
MiddleName=@MiddleName,
LastName=@LastName,
Address=@Address,
Contact=@Contact,
Email=@Email
where StudentID=@StudentID
end
end

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**tanweer** · Accepted Answer · 2013-10-01T21:44:00

Hi,
I modified your code try it now:

C#

public void AddstudentDetails(int SystemID, string StudentNumber, string FirstName,string MiddleName,string LastName,string address, string contact,string Email)
            {
                SqlConnection con = new SqlConnection();
                con.ConnectionString = ConfigurationManager.ConnectionStrings["smsysConnectionString"].ConnectionString;
 
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = con;
                cmd.CommandText = "sp_AddStudentDetails";
                cmd.CommandType = CommandType.StoredProcedure;
 

                SqlParameter parameterSystemID = new SqlParameter("@SystemId",SqlDbType.Int,4);
                parameterSystemID.Value=SystemID;
                cmd.Parameters.Add(parameterSystemID);
 
                SqlParameter parameterStudentNumber = new SqlParameter("@StudentNumber", SqlDbType.VarChar, 50);
                parameterStudentNumber.Value = StudentNumber;
                cmd.Parameters.Add(parameterStudentNumber);
 
                SqlParameter parameterFirstName = new SqlParameter("@FirstName", SqlDbType.VarChar, 50);
                parameterFirstName.Value = FirstName;
                cmd.Parameters.Add(parameterFirstName);
 
                SqlParameter parameterMiddleName = new SqlParameter("@MiddleName", SqlDbType.VarChar, 50);
                parameterMiddleName.Value = MiddleName;
                cmd.Parameters.Add(parameterMiddleName);
 
                SqlParameter parameterLastName = new SqlParameter("@LastName", SqlDbType.VarChar, 50);
                parameterLastName.Value = LastName;
                cmd.Parameters.Add(parameterLastName);
 
                SqlParameter parameterAddress = new SqlParameter("@Addresss", SqlDbType.VarChar, 50);
                parameterAddress.Value = address;
                cmd.Parameters.Add(parameterAddress);
 
                SqlParameter parameterContact = new SqlParameter("@Contact", SqlDbType.VarChar, 11);
                parameterContact.Value = contact;
                cmd.Parameters.Add(parameterContact);
 
                SqlParameter parameterEmail = new SqlParameter("@Email", SqlDbType.VarChar,50);
                parameterEmail.Value = Email;
                cmd.Parameters.Add(parameterEmail);
 
                try
                {
                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                }
                catch (Exception ex)
                {
 
                }
            }

I found a mistake here on this line

C#

parameterLastName.Value = LastName;

what you have done is

C#

parameterLastName.Value = parameterLastName;