how to convert varchar to float.

Question

1.33/5 (2 votes)

See more:

here with attched my coding it shows following error can anyone correct the error.

Error:

SQL

Error converting data type varchar to float.

Error Codding:

price_range = BulletedList3.Items[e.Index].Value;
       if (con.State == ConnectionState.Closed)
       {
           con.Open();
       }
       SqlCommand cmd = new SqlCommand("select pro_img,pro_name,price from product where price= '" + price_range + "'and status='A' and type='retail' ", con);
       SqlDataAdapter da = new SqlDataAdapter(cmd);
       DataSet ds = new DataSet();
       da.Fill(ds);
       DataList1.DataSource = ds;
       DataList1.DataBind();
       con.Close();

Posted 18-Nov-11 18:49pm

M.Narmatha

Updated 18-Nov-11 18:56pm

v2

Add a Solution

Comments

srinivas vadepally 19-Nov-11 4:04am

Narmatha,
Datatypes of attribute from front end and back end(Database) should be equal.
You are inserting price in textbox, treated as string.
So the exception has come.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

ntsonawane · Answer 1 · 2011-11-18T18:56:00

Solution 2

if your price column is float in Database

use it

C#

SqlCommand cmd = new SqlCommand("select pro_img,pro_name,price from product where price= " + price_range.ToString() + " and status='A' and type='retail' ", con);

Posted 18-Nov-11 18:56pm

ntsonawane

Updated 18-Nov-11 19:07pm

v3

Comments

Mehdi Gholam 19-Nov-11 1:39am

Clarification : numbers should not be in quotes in SQL queries.

Mehdi Gholam 19-Nov-11 1:40am

5'ed

deepakdynamite · Answer 2 · 2011-11-18T18:54:00

Solution 1

Use float.tryparse while conversion.. I think you know how to use it , if not then follow this link

http://msdn.microsoft.com/en-us/library/994c0zb1.aspx[^]

Posted 18-Nov-11 18:54pm

deepakdynamite

Comments

Member 11837260 8-Mar-16 11:19am

if anybody can help me with this, i have the same problem: "Error converting data type to float" ?

// This is my Button

protected void Button1_Click(object sender, EventArgs e)
{
txtDate3.Text = txtDatepicker.Text.Substring(0, 2);
txtDate2.Text = txtDatepicker.Text.Substring(2, 4);
txtDate1.Text = txtDatepicker.Text.Substring(6, 4);
txtDateTampon_1.Text = txtDate1.Text + txtDate2.Text + txtDate3.Text + " 00:00:00";

txtDate4.Text = txtDatepicker0.Text.Substring(0, 2);
txtDate5.Text = txtDatepicker0.Text.Substring(2, 4);
txtDate6.Text = txtDatepicker0.Text.Substring(6, 4);
txtDateTampon_2.Text = txtDate6.Text + txtDate5.Text + txtDate4.Text + " 00:00:00";

DateTime dt1 = DateTime.Parse(txtDateTampon_1.Text);
DateTime dt3 = DateTime.Parse(txtDateTampon_2.Text);
DateTime dt2 = DateTime.Parse(DateTime.Now.ToString());

if (txtDatepicker.Text == "" || txtDatepicker0.Text == "")
{
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Vous devez remplir tous les champs!')", true);
}

else if (dt1 > dt3)
{
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Les dates saisies ne conviennent pas')", true);
}

else if ((dt1 > dt2) || (dt3 > dt2))
{
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Date saisie postérieure à la date du jour')", true);
}

else if ((txtDateTampon_1.Text == "dd/mm/yyyy") || (txtDatepicker0.Text == "dd/mm/yyyy"))
{
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('il faut entrer une date valide!')", true);
}

else
{

SqlConnection con = new SqlConnection();
con.ConnectionString = ConfigurationManager.ConnectionStrings["servicegenerauxConnectionString"].ToString();
con.Open();

strSql = " select NoCommande, NomEntreprise, NoFacture, EtatCommande, CoutTotal, Rabais, Frais, DateCommande, DateLivraison, DatePaiement, NumeroCompte from Commandes where DatePaiement between '" + convertQuotes(txtDateTampon_1.Text) + "' and '" + convertQuotes(txtDateTampon_2.Text) + "' order by NoCommande";

cmd = new SqlCommand(strSql, con);
SqlCommand myCommand = new SqlCommand(strSql, con);

SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();

con.Close();

GridView1.AllowPaging = false;
GridView1.DataBind();

using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["servicegenerauxConnectionString"].ToString()))
{
using (SqlCommand comm = new SqlCommand())
{
comm.Connection = conn;
conn.Open();
for (int j = 0; j <= GridView1.Rows.Count - 1; j++)
{

strSql3 = "INSERT into Tbl_CommandePaye_ParPeriode Values ('" + convertQuotes(GridView1.Rows[j].Cells[0].Text.Trim().ToString()) + "', '" + convertQuotes(GridView1.Rows[j].Cells[1].Text.Trim().ToString()) + "', '" + convertQuotes(GridView1.Rows[j].Cells[2].Text.Trim().ToString()) + "', '" + convertQuotes(GridView1.Rows[j].Cells[3].Text.Trim().ToString()) + "', '" + convertQuotes(GridView1.Rows[j].Cells[4].Text.Trim().ToString()) + "', '" + convertQuotes(GridView1.Rows[j].Cells[5].Text.Trim().ToString()) + "', '" + convertQuotes(GridView1.Rows[j].Cells[6].Text.Trim().ToString()) + "', '" + convertQuotes(GridView1.Rows[j].Cells[7].Text.Trim().ToString()) + "', '" + convertQuotes(GridView1.Rows[j].Cells[8].Text.Trim().ToString()) + "', '

Member 11837260 8-Mar-16 11:22am

data cannot insert to my table, always telle me this msg.