Question

I have a insert stored procedure and I want to check whether the email already exists or not if exists I have to show an error to the user but how to throw the error and catch it in the code behind?

CREATE procedure [dbo].[SP_ProfileRegMaster]
    @UserId Varchar(50),
    @FirstName Varchar(50)
    @EmailID varchar (50)
    @result int out)
AS
BEGIN
    IF EXISTS (SELECT EmailId FROM Profile_Master WHERE EmailId = @EmailId)
    BEGIN
        SET @result = 0
    ELSE
       RAISERROR ('Email address does not exist.', 1, 1)
END

C# code:

result = cmd1.Parameters.Add("@result", System.Data.SqlDbType.Int);
result.Direction = System.Data.ParameterDirection.Output;

Answer 1

As I mentioned in my comment, I’d not use RAISERROR() in your case. You could do something like this:

Stored Procedure

CREATE procedure [dbo].[SP_ProfileRegMaster]
  @UserId  Varchar(50),
  @FirstName  Varchar(50)
  @EmailID varchar (50))
AS BEGIN
  if exists(select EmailId from Profile_Master where EmailId=@EmailId)
  begin
    return 0
  else
    return 1
  end
end

C# code

SqlConnection conn = new SqlConnection(getConnectionString())
SqlCommand cmd = new SqlCommand("SP_ProfileRegMaster", conn);
cmd.CommandType = CommandType.StoredProcedure;

// Pass parameters to Stored Proc...

// Add one more parameter to store the Return Value
var returnParameter = cmd.Parameters.Add("@ReturnVal", SqlDbType.Int);
returnParameter.Direction = ParameterDirection.ReturnValue;

conn.Open();
cmd.ExecuteNonQuery();
// Retrieve the return value
var result = returnParameter.Value;