Day i do not know

700. Search in a Binary Search Tree/700. Search in a Binary Search Tree.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_700._Search_in_a_Binary_Search_Tree</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

700. Search in a Binary Search Tree/Program.cs

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+namespace _700._Search_in_a_Binary_Search_Tree;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine("Hello, World!");
+    }
+}

700. Search in a Binary Search Tree/Solution.cs

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+namespace _700._Search_in_a_Binary_Search_Tree;
+
+public class Solution
+{
+    public TreeNode? SearchBST(TreeNode? root, int val)
+    {
+        Stack<TreeNode> stack = new Stack<TreeNode>();
+        if (root != null)
+            stack.Push(root);
+        while (stack.Count > 0)
+        {
+            TreeNode cur = stack.Pop();
+            if (cur.right != null)
+                stack.Push(cur.right);
+            if (cur.left != null)
+                stack.Push(cur.left);
+            if(cur.val == val)
+                return cur;
+        }
+        return null;
+    }
+}

700. Search in a Binary Search Tree/TreeNode.cs

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+namespace _700._Search_in_a_Binary_Search_Tree;
+
+
+//Definition for a binary tree node.
+public class TreeNode {
+    public int val;
+    public TreeNode? left;
+    public TreeNode? right;
+    public TreeNode(int val=0, TreeNode? left=null, TreeNode? right =null) {
+        this.val = val;
+        this.left = left;
+        this.right = right;
+    }
+}
+