Enabling and disabling field validator for button click

Question

I have two button control. I want to disable the field validator for textboxes when I click btnavail_Click. Its working. But when I click the button btnsubmit_Click the field validator is not enabled.

 protected void btnsubmit_Click(object sender, EventArgs e)
        {
            RequiredFieldValidator2.Enabled = true;
            RequiredFieldValidator3.Enabled = true;
            RequiredFieldValidator4.Enabled = true;
            con.Open();
            SqlCommand cmd1 = new SqlCommand("Select * from tblstudentinfo where StudentId=@studentid", con);
            cmd1.Parameters.AddWithValue("@studentid",txtstudentid.Text.ToString());
            SqlDataReader rdr=cmd1.ExecuteReader();
            if(rdr.Read())
            {
                int i=Convert.ToInt32(rdr["Password"]);
                int j=Convert.ToInt32(txtpassword.Text);
                if(i == j)
                {
                    SqlCommand cmd2 = new SqlCommand("select * from tblbookinfo where Name=@bookname", con);
                    cmd2.Parameters.AddWithValue("@bookname", txtbookname.Text.ToString());
                    SqlDataReader rdr1 = cmd2.ExecuteReader();
                    if (rdr1.Read())
                    {
                        int s = Convert.ToInt32(rdr1["BookId"]);
                        SqlCommand cmd = new SqlCommand("inserttotbllendinginfo2", con);
                        cmd.CommandType = CommandType.StoredProcedure;

                        cmd.Parameters.Add(new SqlParameter
                        {
                            ParameterName = "@bookid",
                            SqlDbType = SqlDbType.Int,
                            Value = s
                        });
                        cmd.Parameters.Add(new SqlParameter
                        {
                            ParameterName = "@studentid",
                            SqlDbType = SqlDbType.Int,
                            Value = Convert.ToInt32(txtstudentid.Text)
                        });
                        cmd.Parameters.Add(new SqlParameter
                        {
                            ParameterName = "@noofbooks",
                            SqlDbType = SqlDbType.Int,
                            Value = Convert.ToInt32(txtnoofbook.Text)
                        });
                        cmd.Parameters.Add(new SqlParameter
                        {
                            ParameterName = "@dateoflending",
                            SqlDbType = SqlDbType.Date,
                            Value = txtdate.Text
                        });
                        cmd.ExecuteNonQuery();
                    }
                 }
                else
                {
                    lblpassword.Visible=true;
                    lblpassword.Text="Your password is incorrect. Please Check it";
                    lblpassword.ForeColor = System.Drawing.Color.Red;
                }

                con.Close();
              }
        }

        protected void btnavail_Click(object sender, EventArgs e)
        {
            RequiredFieldValidator2.Enabled = false;
            RequiredFieldValidator3.Enabled = false;
            RequiredFieldValidator4.Enabled = false;

            SqlCommand cmd = new SqlCommand("select * from tblbookinfo where Name=@bookname", con);
            cmd.Parameters.AddWithValue("@bookname", txtbookname.Text.ToString());
            con.Open();
            if (String.IsNullOrEmpty(txtbookname.Text))
            {
                lblbookavail.Visible = true;
                lblbookavail.Text = "Please enter a valid book name";
                lblbookavail.ForeColor = System.Drawing.Color.Red;
            }
            else
            {
            SqlDataReader rdr = cmd.ExecuteReader();            
                if (rdr.Read())
                {
                    string s = rdr["Name"].ToString();
                    if (s != null)
                    {
                        int i = Convert.ToInt32(rdr["AvailableBooks"]);
                        lblbookavail.Visible = true;
                        lblbookavail.Text = (i.ToString());
                    }
            }
            }
           con.Close();
            }

I made causes validation property for both the buttons to false. I need to enable the validator when I click btnsubmit_Click. Please someone help me.


            Book Name 
                
                
            Student Id 
                
            No of Book 
                
            Date of lending 
            Password

This my HTML code. I want to disable Field validator for studentid,no of books and password on btnavail_click. Again I need to enable them for btnsubmit_click

Rahul Singh · Accepted Answer

That's because, you are enabling your RequiredFieldValidator in server side code i.e. on button click event handler and validation controls like RequiredFieldValidator works on client side. This means when you click on Submit buttton, since your validator was disabled it didn't worked and form was posted to the server, now even if you enable the Validator now, its of no use since form is already posted.

Instead of Enabling & Disabling the validator controls, you should set the CausesValidation property for each button control to either true or false, like this:-

Update:

Since you don't want validation on btnavail button, set CausesValidation="false" for this button, your mark-up should look like:-

Enabling and disabling field validator for button click

Answers (2)

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