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private void button1_Click(object sender, EventArgs e)
{
SqlConnection myConn = new SqlConnection("strConnection");
SqlDataAdapter sqlda = new SqlDataAdapter("select * from 数据表名称 where 条件 ", myConn);
DataTable dt = new DataTable("tb_User");
sqlda.Fill(dt);
cboxUName.DataSource = dt;
cboxUName.DisplayMember = "UserName";
//cboxUName.ValueMember = ""; // 如果返回值存另一个表,加上这行. 登录验证,感觉没必要
}
this.ComboBox.ValueMember = "ID字段";
this.ComboBox.DisplayMember = "显示字段";