plz通过组合框解决此错误到搜索数据 [英] plz solve this Error into search data by combobox

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问题描述

通过combobox从数据库搜索数据到datagridview

我的表: - uid navarchar(50)[数据类型]

名称Varchar(50)[数据类型] // dispalyname在组合框中



错误: - 列名'mb08'(uid)无效。



  private   void  comboBox2_SelectedIndexChanged( object  sender,EventArgs e)
{

string qry = select * from tbmobile其中uid = + comboBox2.SelectedValue;
SqlDataAdapter da = new SqlDataAdapter(qry,con);
DataTable dt = new DataTable();
da.Fill(dt);
dataGridView1.DataSource = dt;
dataGridView1.Refresh();
}

解决方案

你应该使用 SelectedItem 如此处所述 [ ^ ]。您还应该使用正确的参数化查询,尤其是因为您不知道从组合框中返回什么。


在您的代码中尝试以下更改。

< pre lang =c#> string qry = 选择*来自tbmobile,其中uid =' + comboBox2.SelectedValue + ';



希望它能起作用。


Search Data from database by combobox into datagridview
my table:- uid navarchar(50)[Datatype]
Name Varchar(50)[Datatype]// dispalyname in combobox

ERROR:- Invalid column name 'mb08'(uid).

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
       {

           string qry = "select * from tbmobile where uid=" + comboBox2.SelectedValue;
           SqlDataAdapter da = new SqlDataAdapter( qry,con);
           DataTable dt = new DataTable();
           da.Fill(dt);
           dataGridView1.DataSource = dt;
           dataGridView1.Refresh();
       }

You should use SelectedItem as described here[^]. You should also be using proper parameterised queries, especially as you have no idea what will be returned from the combobox.


Try following changes in your code.

string qry = "select * from tbmobile where uid='" + comboBox2.SelectedValue + "'";


Hope it will work.


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