将一条数据提交到DataTable并在GridView里显示的问题！

[xycit]

页面有一行文本框做数据录入，一个按钮将数据提交到DataTable，并在GridView里显示！代码如下：

 protected void Button4_Click(object sender, EventArgs e)
        {
            if (this.TextBox6.Text != "" && this.TextBox7.Text != "" && this.TextBox8.Text != "" && this.TextBox9.Text != "" && this.TextBox10.Text != "" && this.TextBox11.Text != "")
            {
                DataTable dt = new DataTable();
                dt.Columns.Add("clothname");
                dt.Columns.Add("color");
                dt.Columns.Add("purpose");
                dt.Columns.Add("source");
                dt.Columns.Add("technology_Width");
                dt.Columns.Add("technology_singleexpend");
                dt.Columns.Add("cutout_Width");
                dt.Columns.Add("cutout_singleexpend");
                dt.Columns.Add("stock_Width");
                dt.Columns.Add("stock_singleexpend");
                dt.Columns.Add("clientprovider_Width");
                dt.Columns.Add("clientprovider_singleexpend");
                DataRow dr = dt.NewRow();
                dr["clothname"] = this.TextBox6.Text.ToString();
                dr["color"] = this.TextBox7.Text.ToString();
                dr["purpose"] =this.DropDownList2.Text.ToString();
                dr["source"] =this.DropDownList3.Text.ToString();
                dr["technology_Width"] =this.DropDownList4.Text.ToString();
                dr["technology_singleexpend"] =this.TextBox8.Text.ToString();
                dr["cutout_Width"] =this.DropDownList5.Text.ToString();
                dr["cutout_singleexpend"] =this.TextBox9.Text.ToString();
                dr["stock_Width"] =this.DropDownList6.Text.ToString();
                dr["stock_singleexpend"] =this.TextBox10.Text.ToString();
                dr["clientprovider_Width"] =this.DropDownList7.Text.ToString();
                dr["clientprovider_singleexpend"] = this.TextBox11.Text.ToString();
                
                dt.Rows.Add(dr);
                this.GridView1.DataSource = dt;
                this.GridView1.DataBind();
                
            }else
            {
                MessageBox.Show(Button4, Button4.GetType(), "请将数据填写完整！");
            }

问题就是我想重复提交（点提交按钮提交一行GridView就显示一行），并在GridView里显示多条数据！我现在的方法在GridView里只能显示一条数据！
求解决方案！（数据不进数据库！都是在内存中操作！）

[HDNGO]

ViewState一下吧，要不然，肯定丢了~

[xycit]

非常感谢‘潇湘夜雨’问题已解决！

[mengxj85]

用静态变量（考虑用户数量，多人公用会出错）保存Datatable，或者Session……

[takako_mu]

因為你每次都是new一個新Datatable出來,
可以定義一個全局變量的Datatable

[lovehongyun]

随便写了一下,你试试吧,代码重复的部分可以提出来做成方法

protected void Button4_Click(object sender, EventArgs e)
        {
            if (this.TextBox6.Text != "" && this.TextBox7.Text != "" && this.TextBox8.Text != "" && this.TextBox9.Text != "" && this.TextBox10.Text != "" && this.TextBox11.Text != "")
            {
				DataTable dt = null;
				if(ViewState["dt"]!=null)
				{
					dt = (DataTable)ViewState["dt"];
					DataRow dr = dt.NewRow();
					dr["clothname"] = this.TextBox6.Text.ToString();
					dr["color"] = this.TextBox7.Text.ToString();
					dr["purpose"] =this.DropDownList2.Text.ToString();
					dr["source"] =this.DropDownList3.Text.ToString();
					dr["technology_Width"] =this.DropDownList4.Text.ToString();
					dr["technology_singleexpend"] =this.TextBox8.Text.ToString();
					dr["cutout_Width"] =this.DropDownList5.Text.ToString();
					dr["cutout_singleexpend"] =this.TextBox9.Text.ToString();
					dr["stock_Width"] =this.DropDownList6.Text.ToString();
					dr["stock_singleexpend"] =this.TextBox10.Text.ToString();
					dr["clientprovider_Width"] =this.DropDownList7.Text.ToString();
					dr["clientprovider_singleexpend"] = this.TextBox11.Text.ToString();
					
					dt.Rows.Add(dr);

				}
				else
				{
					dt = new DataTable();
					dt.Columns.Add("clothname");
					dt.Columns.Add("color");
					dt.Columns.Add("purpose");
					dt.Columns.Add("source");
					dt.Columns.Add("technology_Width");
					dt.Columns.Add("technology_singleexpend");
					dt.Columns.Add("cutout_Width");
					dt.Columns.Add("cutout_singleexpend");
					dt.Columns.Add("stock_Width");
					dt.Columns.Add("stock_singleexpend");
					dt.Columns.Add("clientprovider_Width");
					dt.Columns.Add("clientprovider_singleexpend");
					DataRow dr = dt.NewRow();
					dr["clothname"] = this.TextBox6.Text.ToString();
					dr["color"] = this.TextBox7.Text.ToString();
					dr["purpose"] =this.DropDownList2.Text.ToString();
					dr["source"] =this.DropDownList3.Text.ToString();
					dr["technology_Width"] =this.DropDownList4.Text.ToString();
					dr["technology_singleexpend"] =this.TextBox8.Text.ToString();
					dr["cutout_Width"] =this.DropDownList5.Text.ToString();
					dr["cutout_singleexpend"] =this.TextBox9.Text.ToString();
					dr["stock_Width"] =this.DropDownList6.Text.ToString();
					dr["stock_singleexpend"] =this.TextBox10.Text.ToString();
					dr["clientprovider_Width"] =this.DropDownList7.Text.ToString();
					dr["clientprovider_singleexpend"] = this.TextBox11.Text.ToString();
					
					dt.Rows.Add(dr);
				}
                
				ViewState["dt"] = dt;
                this.GridView1.DataSource = dt;
                this.GridView1.DataBind();
                
            }else
            {
                MessageBox.Show(Button4, Button4.GetType(), "请将数据填写完整！");
            }
		}