why this error shown The parameterized query '(@id int,@name nvarchar(4000),@age nvarchar(4000),@phoneno nvarc' expects the parameter '@gender', which was not supplied.

Question

1.00/5 (2 votes)

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SQL-Server-2008

I write a coding for updating data in database
coding of my class stafag's is

C#

class staffAG
    {
        string _name;
        int _id;
        string _age;
        string _phone;
        string _address;
        string _post;
        string _gender;
        public string name
        {
            get
            {
                return _name;
            }
            set
            {
                _name = value;
            }
        }
        public int id
        {
            get
            {
                return _id;
            }
            set
            {
                _id = value;
            }
        }
        public string age
        {
            get
            {
                return _age;
            }
            set
            {
                _age = value;
            }
        }
        public string phone
        {
            get
            {
                return _phone;
            }
            set
            {
                _phone = value;
            }
        }
        public string address
        {
            get
            {
                return _address;
            }
            set
            {
                _address = value;
            }
        }
        public string post
        {
            get
            {
                return _post;
            }
            set
            {
                _post = value;
            }
        }
        public string gender
        {
            get
            {
                return _gender;
            }
            set
            {
                _gender = value;
            }
        }
    }
}

and coding of my class staff is

C#

public void updatestaff(staffAG j)
        {
            cn.Open();
            cmd = new SqlCommand("update staff set name = @name,age = @age,phoneno = @phoneno,address = @address,post = @post,gender = @gender where id = @id", cn);
            cmd.Parameters.AddWithValue("@id", j.id);
            cmd.Parameters.AddWithValue("@name",j.name);
            cmd.Parameters.AddWithValue("@age",j.age);
            cmd.Parameters.AddWithValue("@phoneno",j.phone);
            cmd.Parameters.AddWithValue("@address",j.address);
            cmd.Parameters.AddWithValue("@post",j.post);
            cmd.Parameters.AddWithValue("@gender",j.gender);


            cmd.ExecuteNonQuery();
            cn.Close();
            {
                MessageBox.Show("Added");
            }
        }

coding of my update button is

C#

private void button1_Click(object sender, EventArgs e)
        {
            Staff s = new Staff();
            staffAG j = new staffAG();
            j.id = comboBox2.SelectedIndex;
            j.name = textBox2.Text;
            j.age = textBox3.Text;
            j.phone = textBox4.Text;
            j.address = textBox5.Text;
            j.post = comboBox1.Text;
            s.updatestaff(j);
            MessageBox.Show("Record updated");
        }

but when i press the update button this error is displayed

Quote:
The parameterized query '(@id int,@name nvarchar(4000),@age nvarchar(4000),@phoneno nvarc' expects the parameter '@gender', which was not supplied.

please help me..

Posted 24-Feb-14 7:24am

Member 10481714

Updated 24-Feb-14 7:38am

CHill60

v2

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Maciej Los · Answer 1 · 2014-02-24T07:40:00

Solution 1

You did not set up gender property!

C#

Staff s = new Staff();
            staffAG j = new staffAG();
            j.id = comboBox2.SelectedIndex;
            j.name = textBox2.Text;
            j.age = textBox3.Text;
            j.phone = textBox4.Text;
            j.address = textBox5.Text;
            j.post = comboBox1.Text;
            j.gender = ???
            s.updatestaff(j);

Posted 24-Feb-14 7:40am

Maciej Los

Comments

Member 10481714 24-Feb-14 14:39pm

thanks friend this problem is solved
but updating is not being done.
private void button1_Click(object sender, EventArgs e)
{
Staff s = new Staff();
staffAG j = new staffAG();
j.id = comboBox1.Text;
j.name = textBox2.Text;
j.age = textBox3.Text;
j.phone = textBox4.Text;
j.address = textBox5.Text;
j.post = comboBox1.Text;
s.updatestaff(j);
MessageBox.Show("Record updated");
}
where i write j.id=combobox1.text; here an error shown "Cannot implicitly convert type 'string' to 'int' "

Maciej Los 24-Feb-14 14:49pm

id property stores integer value and you set text instead integer. You need to convert text to integer.

Member 10481714 24-Feb-14 23:45pm

how....?
i am trying to convert it like
j.id=convert.int32(combobox1.text);
it shows error

Member 10481714 24-Feb-14 23:55pm

Input string was not in a correct format.

Maciej Los 25-Feb-14 1:32am

Convert.ToInt32!

CHill60 · Answer 2 · 2014-02-24T07:40:00

Solution 2

In your function public void updatestaff(staffAG j) you are attempting to pass in the parameter @gender by setting it to j.gender but in your function private void button1_Click(object sender, EventArgs e) you have not set j.gender to any value.

Posted 24-Feb-14 7:40am

CHill60

OriginalGriff · Answer 3 · 2014-02-24T07:41:00

Simply because the value of gender is never set:

C#

private void button1_Click(object sender, EventArgs e)
        {
            Staff s = new Staff();
            staffAG j = new staffAG();
            j.id = comboBox2.SelectedIndex;
            j.name = textBox2.Text;
            j.age = textBox3.Text;
            j.phone = textBox4.Text;
            j.address = textBox5.Text;
            j.post = comboBox1.Text;
            s.updatestaff(j);
            MessageBox.Show("Record updated");
        }

You set the other properties of the staffAG instance, but since you don't set gender, it remains null.
Null passed as a parameter to a column that can't be null, will throw an exception.

BTW: The standards for naming in C# is for an initial uppercase character for properties - it's a good idea to stick with such standards.

Rahul Vohra · Answer 4 · 2014-02-24T07:53:00

Solution 4

It expects the parameter '@gender', which was not supplied..... :-|

Please check that you have not supplied a value for Gender!!

Posted 24-Feb-14 7:53am

Rahul Vohra

Comments

Maciej Los 24-Feb-14 14:42pm

Please, read the question carefully! Parameter has been successfully set:
cmd.Parameters.AddWithValue("@gender",j.gender);

Rahul Vohra 24-Feb-14 15:45pm

Please replace your button1_click event handler to following:

private void button1_Click(object sender, EventArgs e)
{
Staff s = new Staff();
staffAG j = new staffAG();
j.id = comboBox2.SelectedIndex;
j.name = textBox2.Text;
j.age = textBox3.Text;
j.phone = textBox4.Text;
j.gender = "Male";

j.address = textBox5.Text;
j.post = comboBox1.Text;
s.updatestaff(j);
MessageBox.Show("Record updated");
}

and see if it works!