本文介绍了如何解决此错误:对象引用未设置为对象的实例。的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

自昨晚以来我自动遇到此问题。当我想在数据库中保存我的数据时,我的窗口中会出现此错误。



我尝试了什么:



I have this problem since last night automatically. When I want to save my data in data base this error is appears in my window.

What I have tried:

protected void Button2_Click(object sender, EventArgs e)
    {
        con.Open();
        string query1 = "insert into  AboutVennder(Name,Address,Phone,Email,SallerStatus) values (@name,@add,@phone,@email,@status)";
        cmd = new SqlCommand(query1, con);
         cmd.Parameters.AddWithValue("@name", TextBox1.Text.ToString());
        cmd.Parameters.AddWithValue("@add", TextBox14.Text.ToString());
        cmd.Parameters.AddWithValue("@phone", TextBox16.Text.ToString());
        cmd.Parameters.AddWithValue("@email", TextBox17.Text.ToString());
        cmd.Parameters.AddWithValue("@status", sts);
        cmd.ExecuteNonQuery();
        con.Close();
        Panel3.Visible = false;
        Panel1.Attributes.CssStyle.Add("opacity", "1");
        Panel1.Enabled = true;
        TextBox25.Text = TextBox1.Text;
    }



其Dropdown coading:


Its Dropdown coading:

else if(!Page.IsPostBack)
       {
           SqlConnection cn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True");
              string cm = ("select Name from AboutVennder");
              SqlDataAdapter da = new SqlDataAdapter(cm,cn);
               DataTable dt= new DataTable();

               da.Fill(dt);
               DropDownList7.DataSource = dt;
               DropDownList7.DataBind();
               DropDownList7.DataTextField = "Name";
               DropDownList7.DataBind();
               DropDownList7.Items.Add("Creat");

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08-15 23:26
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