Convert float value and insert in Database using C# and VB.Net in ASP.Net

Hi dorsa,

Refer below sample.

HTML

<asp:TextBox runat="server" ID="txtNumber" />
<br />
<asp:Button Text="Insert" runat="server" OnClick="Save" />
<br />
<asp:GridView ID="gvFloatValues" runat="server" AutoGenerateColumns="false" OnRowDataBound="gvFloatValues_RowDataBound">
    <Columns>
        <asp:BoundField DataField="Data" HeaderText="Data" />
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Configuration;
using System.Data;
using System.Data.SqlClient;

VB.Net

Imports System.Data.SqlClient
Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    BindGrid();
}

private void BindGrid()
{
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    SqlConnection con = new SqlConnection(constr);
    SqlCommand cmd = new SqlCommand("SELECT Data FROM FloatValues", con);
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataTable dt = new DataTable();
    da.Fill(dt);
    gvFloatValues.DataSource = dt;
    gvFloatValues.DataBind();
}

protected void Save(object sender, EventArgs e)
{
    decimal number = Convert.ToDecimal(txtNumber.Text);
    decimal calculateValue = number / 10;
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    SqlConnection con = new SqlConnection(constr);
    SqlCommand cmd = new SqlCommand("INSERT INTO FloatValues VALUES(@calculatedValue)", con);
    cmd.Parameters.AddWithValue("@calculatedValue", calculateValue);
    con.Open();
    cmd.ExecuteNonQuery();
    con.Close();
    BindGrid();
}

protected void gvFloatValues_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        e.Row.Cells[0].Text = (Convert.ToDouble(e.Row.Cells[0].Text) * 10).ToString("F2");
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    BindGrid()
End Sub

Private Sub BindGrid()
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim con As SqlConnection = New SqlConnection(constr)
    Dim cmd As SqlCommand = New SqlCommand("SELECT Data FROM FloatValues", con)
    Dim da As SqlDataAdapter = New SqlDataAdapter(cmd)
    Dim dt As DataTable = New DataTable()
    da.Fill(dt)
    gvFloatValues.DataSource = dt
    gvFloatValues.DataBind()
End Sub

Protected Sub Save(ByVal sender As Object, ByVal e As EventArgs)
    Dim number As Decimal = Convert.ToDecimal(txtNumber.Text)
    Dim calculateValue As Decimal = number / 10
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim con As SqlConnection = New SqlConnection(constr)
    Dim cmd As SqlCommand = New SqlCommand("INSERT INTO FloatValues VALUES(@calculatedValue)", con)
    cmd.Parameters.AddWithValue("@calculatedValue", calculateValue)
    con.Open()
    cmd.ExecuteNonQuery()
    con.Close()
    BindGrid()
End Sub

Protected Sub gvFloatValues_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.DataRow Then
        e.Row.Cells(0).Text = (Convert.ToDecimal(e.Row.Cells(0).Text) * 10).ToString("F2")
    End If
End Sub

Screenshot