Get Value from database using combobox

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C#

gn.cnopen();
  cmd = new SqlCommand("FETCHPERSONS_AMT", gn.cn());
            cmd.Parameters.AddWithValue("@roomtype", comboBox2.SelectedItem);
            string s = comboBox2.SelectedItem.ToString();
            
            SqlDataReader dr;
            dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                txtrnoofpersons.Text = dr["noofpersons"].ToString();
                textBox2.Text = dr["rent"].ToString();
            }
        }

Here i passed value from combo box and retrieving value from database. the value should be filled in text box as mentioned above. i am getting error by using this code

Posted 27-Aug-12 18:56pm

Umapathi K

Updated 27-Aug-12 19:07pm

Ganesan Senthilvel

v2

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Ganesan Senthilvel 28-Aug-12 1:07am

Code format

Ganesan Senthilvel 28-Aug-12 1:07am

What is the error message?

Umapathi K 28-Aug-12 1:13am

incorrect syntax near "FETCHPERSONS_AMT"

Sarrrva 28-Aug-12 2:59am

show your Store procedure code?

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ridoy · Answer 1 · 2012-08-27T20:46:00

the problem is in this line..

cmd = new SqlCommand("FETCHPERSONS_AMT", gn.cn());

to solve it accurately i need to see your connection code above gn.cnopen().Usually i write it in this way..

C#

SqlCommand cmd = new SqlCommand(myQuery, con);
cmd.Connection = con;

where myQuery is the query string and con is SqlConnection.
So if FETCHPERSONS_AMT is your query sting,then use it as..

cmd = new SqlCommand(FETCHPERSONS_AMT, gn.cn());

If it isn't your problem,then see gn.cn() is ok or not..

D-Kishore · Answer 2 · 2012-08-27T21:18:00

Hi try like this,

string SQLConnectionStr="Your own connection";

SqlConnection sqlConnection = new SqlConnection(SQLConnectionStr);

DataTable dtDataTablesList = new DataTable();

sqlConnection.Open();
SqlCommand sqlCmd = new SqlCommand("FETCHPERSONS_AMT", sqlConnection);
sqlCmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@roomtype", comboBox2.text);
sqlCmd.ExecuteNonQuery();
SqlDataAdapter adptr = new SqlDataAdapter(sqlCmd);
adptr.Fill(dtDataTablesList);
sqlConnection.Close();

if (dtDataTablesList.Rows.Count > 0)
                {
                    
                    foreach (DataRow dr in dtDataTablesList.Rows)
                    {
                	txtrnoofpersons.Text = dr["noofpersons"].ToString();
                	textBox2.Text = dr["rent"].ToString();
                    }
                }

Kuthuparakkal · Answer 3 · 2012-08-27T19:08:00

Combobox.SelectedText
should be used instead Combobox.SelectedItem. Also opportunity for improvement, I see:

C#

try
{

    string connect = "yourconnString";
    SqlConnection scn = new SqlConnection(connect);
    string sp = "FETCHPERSONS_AMT";

    SqlCommand spcmd = new SqlCommand(sp, scn);
    spcmd.CommandType = CommandType.StoredProcedure;

    spcmd.Parameters.AddWithValue("@roomtype", comboBox2.SelectedText);

    SqlDataReader dr;
    //check param value
    //MessageBox.Show(spcmd.Parameters["@roomtype"].Value.ToString());

    scn.Open();

    dr = spcmd.ExecuteReader();


    while (dr.Read())
    {
        txtrnoofpersons.Text = dr["noofpersons"].ToString();
        textBox2.Text = dr["rent"].ToString();
    }

    scn.Close();
    dr.Close();
}
catch (SqlException x)
{
    MessageBox.Show(x.Message.ToString());
}

Get Value from database using combobox

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