plz solve this problm:-i want to search data from database using combobox

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sir i want to search data using combobox(bind with databse)but show this following error

ERROR:-The parameterized query '(@id varchar(50))select * from tbmobile where uid=@id' expects the parameter '@id', which was not supplied.

my code:-

C#

private void comboBox2_SelectedIndexChanged_1(object sender, EventArgs e)
       {
           SqlCommand cmd = new SqlCommand();
           cmd.CommandText = "select * from tbmobile where uid=@id";
           cmd.Connection = con;
           cmd.Parameters.Add("@id",SqlDbType.VarChar, 50).Value = comboBox1.SelectedValue;
           cmd.ExecuteNonQuery();
           SqlDataAdapter da = new SqlDataAdapter(cmd);
           DataTable dt = new DataTable();
           da.Fill(dt);
           dataGridView1.DataSource = dt;
           dataGridView1.Refresh();
       }

Posted 25-Aug-14 19:26pm

Nishant.Chauhan80

Updated 25-Aug-14 20:29pm

VICK

v2

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Neetin_1809 26-Aug-14 1:38am

Can U Check For Display Menber & Value Member of Combobox?

Nishant.Chauhan80 26-Aug-14 1:45am

i also check correct display member & value member

3 solutions

Solution 2

you are passing varchar parameter while required parameter is int
cmd.Parameters.Add("@id", SqlDbType.Int).Value = Convert.ToInt32(comboBox1.SelectedValue);

Posted 25-Aug-14 19:47pm

vikrant vaibhav

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MuhammadUSman1 · Accepted Answer · 2014-08-25T19:44:00

helping link

SqlCommand.Parameters Property

C#

private void comboBox2_SelectedIndexChanged_1(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "select * from tbmobile where uid=@id";
cmd.Connection = con;
cmd.ParametersParameters.AddWithValue("@id",comboBox1.SelectedValue);//add parameter with value may be it is creating any exception.
//remove or comment following line
//cmd.ExecuteNonQuery();

SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
dataGridView1.DataSource = dt;
dataGridView1.Refresh();
}

Hope so it'll work.

Raul Iloc · Accepted Answer · 2014-08-25T19:48:00

You should change your code like this (make no sense to execute non query an given SELECT query) to manage also the case where nothing is selected in your combo box:

C#

private void comboBox2_SelectedIndexChanged_1(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
if(comboBox1.SelectedValue == null)
{
 //No parameter for this case!
 cmd.CommandText = "select * from tbmobile";
}
else
{
 cmd.CommandText = "select * from tbmobile where uid=@id";
 cmd.Parameters.Add("@id",SqlDbType.VarChar, 50);
 cmd.Parameters["@id"]=comboBox1.SelectedValue;
}
//
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
dataGridView1.DataSource = dt;
dataGridView1.Refresh();
}

plz solve this problm:-i want to search data from database using combobox

3 solutions

Solution 1

Solution 2

Solution 3

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