How can Bind DropDown at Run Time ?

Question

4.00/5 (1 vote)

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Dear All,

My Problem is I was Create One page and runtime bind a DropDown. DropDown values Comes from database Properly, and it shows me Proper Format but when i Click Submit Button at That Time It Become Null and like Bellow Code

C#

protected void Page_Load(object sender, EventArgs e)
{
 if (!Page.IsPostBack)
  {
    LoadCompany();
  }
}

public void LoadCompany()
{
 try
 {
  DataSet ds = Dbcompany.GetAllCompany(ConfigurationManager.AppSettings["ConnectionString"]);
            if (ds != null)
            {
                if (ds.Tables[0] != null)
                {
                    if (ds.Tables[0].Rows.Count > 0)
                    {
                        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                        {
                            ListItem li = new ListItem();
                            li.Value = ds.Tables[0].Rows[i]["CompanyId"].ToString();
                            li.Text = ds.Tables[0].Rows[i]["CompanyName"].ToString();
                            ddl_company.Items.Add(li);
                            
                        }
                    }
                }
            }
 }
}

protected void btn_add_Click(object sender, EventArgs e)
{
 //When buttin_Click at that time ddl_company DropDown Become Null so How Can Solwed this.. 
}

If I Remove Page.IsPostBack Condition From Page_Load then all Time DropDown was Fill So When Selected Company all Time 1st..

Pleas Help Me, it's My serious Problem...

Posted 16-Jun-12 1:41am

jasmin_patel

Updated 18-Jun-12 1:12am

v5

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4 solutions

Solution 1

Try This :

C#

       if (!IsPostBack)
       {
           FillDropDownList();
       }


     private void FillDropDownList()
    {
        DataSet ds = new DataSet();
        SqlDataAdapter myda = new SqlDataAdapter("Select fileds  FROM tablename", connection object);
        myda.Fill(ds);
        drop_category.DataSource = ds;
        drop_category.DataValueField = "fileds";
        drop_category.DataBind();
        drop_category.Items.Insert(0, new ListItem("Select", "0"));
    }

Hope this will help you. if not please post it.

Posted 16-Jun-12 1:49am

Mits Machhi

Comments

jasmin_patel 16-Jun-12 8:02am

Dear Sir,

Here When I was Select 3rd OR Any Other Option From DropDown And Click Submit Button At That time FillDropDownList Could Not be Call So now DropDown Become Null..

so when submit my page at that time my dropdown value can be null or not Proper Value ...

[no name] 16-Jun-12 8:23am

can you give some code which is inside the button click event.

jasmin_patel 16-Jun-12 8:41am

protected void btn_add_Click(object sender, EventArgs e)
{
string compnay=ddl_comnapny.SelectedValue;
}

Solution 3

when you call loadcompany set then dropdownlist selected index=0

C#

if (!Page.IsPostBack)
  {
    LoadCompany();
ddl_company.SelectedIndex = 0;
  }

i think after this it will be solved.

Posted 17-Jun-12 21:07pm

Prosan

Solution 4

C#

DataSet ds = new DataSet();
        SqlDataAdapter myda = new SqlDataAdapter("Select columnvalue,columntext   FROM tablename", connection object);
        myda.Fill(ds);
        drop_category.DataSource = ds;
        drop_category.DataTextField = "columntext";
        drop_category.DataValueField = "columnvalue";
        drop_category.DataBind();

Posted 18-Jun-12 1:29am

AshishChaudha

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Pankaj Nikam · Accepted Answer · 2012-06-16T02:25:00

Solution 2

Is the EnableViewState property of the DropDownList set to true?

Posted 16-Jun-12 2:25am

Pankaj Nikam

Comments

jasmin_patel 16-Jun-12 8:36am

yes, it was True.

Pankaj Nikam 16-Jun-12 8:41am

Please post the code like what you handle in the ButtonClick event...

jasmin_patel 18-Jun-12 5:49am

protected void btn_add_Click(object sender, EventArgs e)
{
string compnay=ddl_comnapny.SelectedValue;
}