Error in generating User ID automatically

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C#

ASP.NET

hi guyss
I am getting error in this code.
I am trying to do I am generating auto-incre user id by using
System.Guid U_id = System.Guid.NewGuid(); systems class

System.Guid U_id = System.Guid.NewGuid();
 bjBusinessUI.UserID = Convert.ToInt32(U_id.ToString());
 string strMsg = objDataUserUI.InsertUsers(objBusinessUI);.//This is method 

//Method
public string InsertUsers(Business.Users objUsers)
{
string retUserInsert = string.Empty;
try
{
// string conneString = "Data Source=.;Initial Catalog=Vestigo;Integrated Security=True";
using (SqlConnection conn = Connection.OpenConnection())
{
// conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "INSERT_USER";
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Connection = conn;
SqlParameter[] sqlParams = new SqlParameter[15];

SqlParameter UserName = new SqlParameter("@UserName", objUsers.UserName);
UserName.Direction = System.Data.ParameterDirection.Input;
UserName.DbType = System.Data.DbType.String;
sqlParams[0] = UserName;

SqlParameter FirstName = new SqlParameter("@FirstName", objUsers.FirstName);
FirstName.Direction = System.Data.ParameterDirection.Input;
FirstName.DbType = System.Data.DbType.String;
sqlParams[1] = FirstName;

SqlParameter LastName = new SqlParameter("@LastName", objUsers.LastName);
LastName.Direction = System.Data.ParameterDirection.Input;
LastName.DbType = System.Data.DbType.String;
sqlParams[2] = LastName;

SqlParameter Password = new SqlParameter("@Password", objUsers.Password);
Password.Direction = System.Data.ParameterDirection.Input;
Password.DbType = System.Data.DbType.DateTime;
sqlParams[3] = Password;

SqlParameter Email = new SqlParameter("@Email", objUsers.Email);
Email.Direction = System.Data.ParameterDirection.Input;
Email.DbType = System.Data.DbType.String;
sqlParams[4] = Email;

SqlParameter LastLogIn = new SqlParameter("@LastLogIn", objUsers.LastLogIn);
LastLogIn.Direction = System.Data.ParameterDirection.Input;
LastLogIn.DbType = System.Data.DbType.DateTime;
sqlParams[5] = LastLogIn;

SqlParameter CreatedBy = new SqlParameter("@CreatedBy", objUsers.CreatedBy);
CreatedBy.Direction = System.Data.ParameterDirection.Input;
CreatedBy.DbType = System.Data.DbType.String;
sqlParams[6] = CreatedBy;

SqlParameter CreatedOn = new SqlParameter("@CreatedOn", objUsers.CreatedOn);
CreatedOn.Direction = System.Data.ParameterDirection.Input;
CreatedOn.DbType = System.Data.DbType.DateTime;
sqlParams[7] = CreatedOn;

SqlParameter UpdatedBy = new SqlParameter("@UpdatedBy", objUsers.UpdatedBy);
CreatedOn.Direction = System.Data.ParameterDirection.Input;
CreatedOn.DbType = System.Data.DbType.String;
sqlParams[8] = UpdatedBy;

SqlParameter UpdatedOn = new SqlParameter("@UpdatedOn", objUsers.UpdatedOn);
UpdatedOn.Direction = System.Data.ParameterDirection.Input;
UpdatedOn.DbType = System.Data.DbType.DateTime;
sqlParams[9] = UpdatedOn;

SqlParameter Active = new SqlParameter("@Active", objUsers.Active);
Active.Direction = System.Data.ParameterDirection.Input;
Active.DbType = System.Data.DbType.Boolean;
sqlParams[10] = Active;


//SqlParameter SecurityQuestion = new SqlParameter("@SecurityQuestion", objUsers.SecurityQuestion);
//SecurityQuestion.Direction = System.Data.ParameterDirection.Input;
//SecurityQuestion = System.Data.DbType.DateTime;
//sqlParams[4] = SecurityQuestion;

//SqlParameter Answer = new SqlParameter("@Answer", objUsers.Answer);
//Answer.Direction = System.Data.ParameterDirection.Input;
//Answer.DbType = = System.Data.DbType.DateTime;
//sqlParams[4] = Answer;


cmd.Parameters.AddRange(sqlParams);
cmd.ExecuteNonQuery();
//conn.Close();


}
}
catch (Exception ex)
{

log.Error(System.Reflection.MethodBase.GetCurrentMethod().ToString() + ex.StackTrace);
}
return retUserInsert;

//click event in this event new user is can be added

protected void btnRegister_Click(object sender, EventArgs e)
{
try
{
lblMsg.Text = "";
if (Request.QueryString["UserID"] == null)
{

objBusinessUI.FirstName = txtFirstName.Text.Trim();
objBusinessUI.LastName = txtlastName.Text.Trim();
objBusinessUI.UserName = txtUserName.Text.Trim();
objBusinessUI.Email = txtEmail.Text.Trim();
objBusinessUI.Password = txtPass.Text.Trim();
objBusinessUI.LastLogIn = DateTime.Now;
//ObjbussinessRegistration.CreatedDate = DateTime.Now;
//ObjbussinessRegistration.LastLoginDate = DateTime.Now;
objBusinessUI.Active = "False";
objBusinessUI.CreatedOn = DateTime.Now;

System.Guid U_id = System.Guid.NewGuid();
objBusinessUI.UserID = Convert.ToInt32(U_id.ToString());

string strMsg = objDataUserUI.InsertUsers(objBusinessUI);

}
}
catch (Exception ex)
{

log.Error(System.Reflection.MethodBase.GetCurrentMethod().ToString() + ex.StackTrace);
}



while i set the debugger on it.
Its throws exception like

Format exception is caught
Input string was not in a correct format.

can anybody help me
Thnxx